CN104574495B - A kind of image rendering method and device - Google Patents
A kind of image rendering method and device Download PDFInfo
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- CN104574495B CN104574495B CN201410805582.0A CN201410805582A CN104574495B CN 104574495 B CN104574495 B CN 104574495B CN 201410805582 A CN201410805582 A CN 201410805582A CN 104574495 B CN104574495 B CN 104574495B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
- G06T15/50—Lighting effects
- G06T15/60—Shadow generation
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Abstract
The invention discloses a kind of image rendering method and device.This method includes：Determine the per-vertex lighting value of each pixel of image to be rendered and the direction of illumination and the angle in vertex normal direction of each pixel；According to the direction of illumination and the value of vertex normal angular separation, from the brightness stencil value of the default each pixel of illumination variation template extraction；The difference that the brightness stencil value of each pixel is subtracted obtained by the per-vertex lighting value of this pixel is multiplied by default brightness adjustment coefficient, then the per-vertex lighting value of this pixel is added, the final illumination value of brightness has been adjusted, image rendering is carried out according to the final illumination value.Enable to picture more true, display effect more three-dimensional using the embodiment of the present invention.
Description
Technical field
The present invention relates to technical field of information processing, more particularly to a kind of image rendering method and device.
Background technology
With the development of digital processing device, the game based on digital processing device has also obtained rapid development.Game
Software often refers to substantial amounts of image processing operations, for example, carrying out image rendering to character in game picture etc..Image
Rendering usually needs to consume substantial amounts of messaging resource, and mobile phone etc. moves the messaging resource of digital processing device
It is limited, accordingly, it would be desirable to saving messaging resource of being tried one's best when carrying out image rendering.
At present, mobile digital processing device is general carries out image rendering by per-vertex lighting method.Specifically：
Mobile digital processing device calculates the per-vertex lighting value on actor model each aspect by per-vertex lighting formula,
Then the per-vertex lighting value directly is carried out into role as the final illumination value of actor model to render.
It is due to obtained role although messaging resource can be saved by carrying out image rendering by per-vertex lighting method
Model lacks illumination variation, therefore picture is not true enough, and display effect is not three-dimensional enough.
The content of the invention
In view of this, the present invention proposes a kind of image rendering method and device, enables to that picture is more true, display
Effect is more three-dimensional.
Technical scheme proposed by the present invention is：
A kind of image rendering method, this method includes：
Determine the per-vertex lighting value of each pixel of image to be rendered and direction of illumination and the summit of each pixel
The angle of normal direction；
According to the direction of illumination and the value of vertex normal angular separation, from the default each picture of illumination variation template extraction
The brightness stencil value of vegetarian refreshments；
The difference that the brightness stencil value of each pixel is subtracted obtained by the per-vertex lighting value of this pixel is multiplied by default
Brightness adjustment coefficient, then along with the per-vertex lighting value of this pixel, has been adjusted the final illumination value of brightness, according to
The final illumination value carries out image rendering.
A kind of image rendering device, the device includes illumination and angle determining module, takes color module and adjusting module；
The illumination and angle determining module, the per-vertex lighting value of each pixel for determining image to be rendered, with
And the direction of illumination and the angle in vertex normal direction of each pixel；
It is described to take color module, for the value according to the direction of illumination and vertex normal angular separation, from default illumination
Change the brightness stencil value of each pixel of template extraction；
The adjusting module, the per-vertex lighting value institute for the brightness stencil value of each pixel to be subtracted to this pixel
The difference obtained is multiplied by default brightness adjustment coefficient, then along with the per-vertex lighting value of this pixel, has been adjusted brightness
Final illumination value, image rendering is carried out according to the final illumination value.
As seen from the above technical solution, the embodiment of the present invention determines the per-vertex lighting value of each pixel first, still
From in the prior art directly according to the per-vertex lighting value carry out image rendering unlike, the embodiment of the present invention is further determined that
The direction of illumination of each pixel and the angle in vertex normal direction, and according to the value of the angle from default illumination variation mould
Plate extracts brightness stencil value, and illumination brightness is adjusted on the basis of the per-vertex lighting value according to the brightness stencil value, according to
The final illumination value that have adjusted brightness carries out image rendering, therefore, so that the illumination variation of the picture rendered is fresher
Bright, picture more true, display effect is more three-dimensional.
Brief description of the drawings
Fig. 1 is image rendering method flow chart provided in an embodiment of the present invention.
Fig. 2 is the schematic diagram that brightness provided in an embodiment of the present invention changes template.
Fig. 3 is image rendering apparatus structure schematic diagram provided in an embodiment of the present invention.
Embodiment
Fig. 1 is image rendering method flow chart provided in an embodiment of the present invention.
As shown in figure 1, the flow includes：
Step 101, the per-vertex lighting value of each pixel of image to be rendered and the illumination side of each pixel are determined
To the angle with vertex normal direction.
Wherein it is possible to calculate each summit according to formula I=Ambient+Diffuse* (LightDirNormalDir)
Per-vertex lighting value, wherein, I is per-vertex lighting value, and Ambient represents ambient lighting value, and Diffuse represents to diffuse illumination value, *
Represent to be multiplied, LightDir represents direction of illumination, and NormalDir represents vertex normal direction, (LightDirNormalDir)
It is LightDir and NormalDir dot-product, the dot-product represents the direction of illumination on summit and the folder in vertex normal direction
The size at angle.
Step 102, according to the direction of illumination and the value of vertex normal angular separation, carried from default illumination variation template
Take the brightness stencil value of each pixel.
Step 103, the difference brightness stencil value of each pixel subtracted obtained by the per-vertex lighting value of this pixel multiplies
With default brightness adjustment coefficient, then along with the per-vertex lighting value of this pixel, the final light of brightness has been adjusted
According to value, image rendering is carried out according to the final illumination value.
In the embodiment of the present invention, described default illumination variation template, usually art designing personnel show according to image and imitated
Really, experience etc., the illumination variation template pre-set.
It is corresponding from the illumination variation template extraction by the value according to direction of illumination and the angle in vertex normal direction
Brightness stencil value so that the brightness of image can change according to the change of direction of illumination and the angle in vertex normal direction, because
This, the picture of display is truer.
Further, in order that the picture of display is more three-dimensional, the embodiment of the present invention has been proposed that the illumination variation template
More than two intervals can be included, each interval has corresponded to a span of the angle, wherein, it is same interval interior
Brightness stencil value it is identical, the brightness stencil value in different intervals is different.
In the value according to the angle, from the brightness stencil value of the default each pixel of illumination variation template extraction when,
The span where the value of the angle is determined first, it is then corresponding with the span from the illumination variation module
Brightness stencil value is extracted in interval.
It is identical by the brightness value being divided into illumination variation template in different intervals, same interval, it is different interval interior
Brightness value it is different, can cause when the variable angle of direction of illumination and vertex normal direction is little, opposite vertexes illumination value
Brightness carries out the adjustment of same magnitude, when the variable angle of direction of illumination and vertex normal direction is larger, opposite vertexes illumination value
Brightness carry out the adjustment of different amplitudes so that picture more has corner angle, display effect more three-dimensional.Moreover, same area
In brightness stencil value at the same time it can also reduce store illumination variation template required for memory space.
Fig. 2 is the schematic diagram that brightness provided in an embodiment of the present invention changes template.
In Fig. 2, the shade of filling is more intensive, represents that brightness is darker, conversely, the shade of filling is more sparse, represents that brightness is got over
It is bright, from left to right represent direction of illumination and the angle in vertex normal direction it is ascending, from Figure 2 it can be seen that illumination variation template from
Left-to-right divide into 3 intervals, and the brightness stencil value in each interval is identical, and direction of illumination and the angle in vertex normal direction
Smaller, corresponding brightness is darker, and illumination variation template can also be divided into more or less intervals, specifically can be according to reality
Depending on situation.
In another embodiment, the brightness stencil value gradual change that brightness change template can also be in same interval, no
With the brightness template value mutation in interval.
Because the display screen of mobile terminal is typically small, if the image of display is excessively smooth, third dimension can be lacked, because
This, the embodiment of the present invention, which has been proposed that, further shade is added for image, so that wash with watercolours on the basis of adjustment brightness
Contaminate effect more three-dimensional, be more suitable for showing on mobile terminals.Specifically：
The direction of visual lines and the angle in vertex normal direction of each pixel of image to be rendered are determined, according to the sight
The value of the angle in direction and vertex normal direction, is defined as the shadow factor that each pixel adds shade, according to most
When whole illumination value carries out image rendering, the difference that default shade a reference value is subtracted obtained by the final illumination value is multiplied by described the moon
Shadow coefficient, then along with the final illumination value, obtains with the addition of the final illumination value after shade, according to the addition of after shade
Final illumination value carry out image rendering.
Wherein it is possible to 1 is subtracted poor n powers obtained by the dot-product in the direction of visual lines and vertex normal direction as
The shadow factor of each pixel, n is not less than 1.Wherein, n value is bigger, and the shade of addition is thinner, in order to avoid addition
Shade it is excessively thick and heavy, the authenticity that show of influence picture can only strengthen dark face, now, n value can with bigger than normal,
Such as value is 4,5 etc..
In order to reduce amount of calculation so that above-mentioned image rendering method is more applicable for running on mobile terminals, save and move
The computing resource of dynamic terminal, the embodiment of the present invention is also proposed：
First in the space of summit, per-vertex lighting value, the light on each summit on to be rendered image each summit can be calculated
According to angle, the direction of visual lines on each summit and the angle in vertex normal direction in direction and vertex normal direction.
Then, in pixel space, according to summit space and the corresponding relation of pixel space, it is converted in pixel space
The each corresponding illumination value of pixel and direction of illumination and the angle in vertex normal direction, i.e.,：According to each summit
Per-vertex lighting value, determines the per-vertex lighting value of each pixel of image to be rendered, according to the direction of illumination on each summit
With the angle in vertex normal direction, the direction of illumination and the folder in vertex normal direction of each pixel of image to be rendered are determined
Angle, according to the direction of visual lines on each summit and the angle in vertex normal direction, determines each pixel of image to be rendered
Direction of visual lines and vertex normal direction angle.
Because the calculating of per-vertex lighting value and various angles is all completed in the space of summit, the meter in the space of summit
Calculation amount is typically small, therefore, and the embodiment of the present invention is particularly suitable for use in carries out image rendering on mobile terminals.
According to the above method, the embodiment of the present invention additionally provides a kind of image rendering device, specifically refers to Fig. 3.
Fig. 3 is image rendering apparatus structure schematic diagram provided in an embodiment of the present invention.
As shown in figure 3, the device includes illumination and angle determining module 301, takes color module 302 and adjusting module 303.
Illumination and angle determining module 301, for each pixel for determining image to be rendered per-vertex lighting value and
The direction of illumination and the angle in vertex normal direction of each pixel.
Color module 302 is taken, for the value according to the direction of illumination and vertex normal angular separation, is become from default illumination
Change the brightness stencil value of each pixel of template extraction.
Adjusting module 303, the per-vertex lighting value institute for the brightness stencil value of each pixel to be subtracted to this pixel
The difference obtained is multiplied by default brightness adjustment coefficient, then along with the per-vertex lighting value of this pixel, has been adjusted brightness
Final illumination value, image rendering is carried out according to the final illumination value.
Wherein, the illumination variation template includes more than two intervals, and each interval has corresponded to one of the angle
Brightness stencil value in span, same interval is identical, and the brightness stencil value in different intervals is different；Or, it is same
Brightness template value mutation in brightness stencil value gradual change in interval, different intervals.
Color module 302 is taken, the span where the value of the angle is determined for, from the illumination variation module
Upper interval interior extraction brightness stencil value corresponding with the span.
Wherein, adjusting module 303 can include brightness adjusting section and shade add module.
The brightness adjusting section, the per-vertex lighting for the brightness stencil value of each pixel to be subtracted to this pixel
Difference obtained by value is multiplied by default brightness adjustment coefficient, then along with the per-vertex lighting value of this pixel, is adjusted
The final illumination value of brightness.
Illumination and angle determining module 301, direction of visual lines and summit for each pixel for determining image to be rendered
The angle of normal direction.
The shade add module, for the value according to the direction of visual lines and the angle in vertex normal direction, is defined as
Each pixel adds the shadow factor of shade, and the difference that default shade a reference value is subtracted obtained by the final illumination value is multiplied by
The shadow factor, then along with the final illumination value, obtains with the addition of the final illumination value after shade, according to the addition of
Final illumination value after shade carries out image rendering.
Wherein, the shade add module, the dot-product institute for subtracting the direction of visual lines and vertex normal direction by 1
Poor n powers as each pixel shadow factor, wherein, n be not less than 1.
Wherein, illumination and angle determining module 301 can include illumination and angle calcu-lation module and illumination and angle conversion
Module.
The illumination and angle calcu-lation module, in the space of summit, calculating the summit on each summit of image to be rendered
Illumination value, the angle of the direction of illumination on each summit and vertex normal direction, the direction of visual lines on each summit and vertex normal side
To angle.
The illumination and angle modular converter, in pixel space, according to the per-vertex lighting value on each summit,
The per-vertex lighting value of each pixel of image to be rendered is determined, according to the direction of illumination on each summit and vertex normal side
To angle, the angle in direction of illumination and the vertex normal direction of each pixel of image to be rendered is determined, according to described every
The direction of visual lines on individual summit and the angle in vertex normal direction, determine direction of visual lines and the top of each pixel of image to be rendered
The angle of point normal direction.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modification, equivalent substitution and improvements done within refreshing and principle etc., should be included within the scope of protection of the invention.
Claims (8)
1. a kind of image rendering method, it is characterised in that this method includes：
Determine the per-vertex lighting value of each pixel of image to be rendered and the direction of illumination and vertex normal of each pixel
The angle in direction；
According to the direction of illumination and the value of vertex normal angular separation, from the default each pixel of illumination variation template extraction
Brightness stencil value；
The difference that the brightness stencil value of each pixel is subtracted obtained by the per-vertex lighting value of this pixel is multiplied by default brightness
Regulation coefficient, then along with the per-vertex lighting value of this pixel, has been adjusted the final illumination value of brightness；
Determine the direction of visual lines and the angle in vertex normal direction of each pixel of image to be rendered；According to the direction of visual lines
With the value of the angle in vertex normal direction, it is defined as the shadow factor that each pixel adds shade；
Carrying out image rendering according to the final illumination value includes：Default shade a reference value is subtracted into the final illumination value institute
The difference obtained is multiplied by the shadow factor, then along with the final illumination value, obtains with the addition of the final illumination value after shade,
Image rendering is carried out according to the addition of the final illumination value after shade.
2. according to the method described in claim 1, it is characterised in that the illumination variation template includes more than two intervals,
Each interval has corresponded to a span of the angle；
According to the value of the angle, include from the brightness stencil value of the default each pixel of illumination variation template extraction：
The span where the value of the angle is determined, the interval corresponding with the span from the illumination variation module
Interior extraction brightness stencil value；
Wherein, the brightness stencil value in same interval is identical, and the brightness stencil value in different intervals is different；Or, it is same
Brightness template value mutation in brightness stencil value gradual change in interval, different intervals.
3. according to the method described in claim 1, it is characterised in that be defined as the shadow factor bag that each pixel adds shade
Include：
The poor n powers obtained by dot-product for subtracting the direction of visual lines and vertex normal direction using 1 are used as each pixel
Shadow factor, wherein, n is not less than 1.
4. according to the method described in claim 1, it is characterised in that
In the space of summit, per-vertex lighting value, the direction of illumination on each summit and the summit on each summit of image to be rendered are calculated
The angle of the angle of normal direction, the direction of visual lines on each summit and vertex normal direction；
In pixel space, according to the per-vertex lighting value on each summit, the top of each pixel of image to be rendered is determined
Point illumination value, according to the direction of illumination on each summit and the angle in vertex normal direction, determines each of image to be rendered
The direction of illumination of pixel and the angle in vertex normal direction, according to the direction of visual lines on each summit and vertex normal direction
Angle, determine the angle in direction of visual lines and the vertex normal direction of each pixel of image to be rendered.
5. a kind of image rendering device, it is characterised in that the device includes illumination and angle determining module, takes color module and adjustment
Module；
The illumination and angle determining module, for the per-vertex lighting value of each pixel for determining image to be rendered and every
The direction of illumination of individual pixel and the angle in vertex normal direction；
It is described to take color module, for the value according to the direction of illumination and vertex normal angular separation, from default illumination variation
The brightness stencil value of each pixel of template extraction；
The adjusting module, for the brightness stencil value of each pixel to be subtracted obtained by the per-vertex lighting value of this pixel
Difference is multiplied by default brightness adjustment coefficient, then along with the per-vertex lighting value of this pixel, has been adjusted brightness most
Whole illumination value；
The adjusting module includes brightness adjusting section and shade add module；
The brightness adjusting section, the per-vertex lighting value institute for the brightness stencil value of each pixel to be subtracted to this pixel
The difference obtained is multiplied by default brightness adjustment coefficient, then along with the per-vertex lighting value of this pixel, has been adjusted brightness
Final illumination value；
The illumination and angle determining module, direction of visual lines and vertex normal for each pixel for determining image to be rendered
The angle in direction；
The shade add module, for the value according to the direction of visual lines and the angle in vertex normal direction, is defined as each
Pixel adds the shadow factor of shade, and the difference that default shade a reference value is subtracted obtained by the final illumination value is multiplied by described
Shadow factor, then along with the final illumination value, obtains with the addition of the final illumination value after shade, according to the addition of shade
Final illumination value afterwards carries out image rendering.
6. device according to claim 5, it is characterised in that the illumination variation template includes more than two intervals,
The brightness stencil value that each interval has been corresponded in a span of the angle, same interval is identical, different interval interior
Brightness stencil value it is different；Or, the brightness stencil value gradual change in same interval, the brightness stencil value in different intervals is dashed forward
Become；
It is described to take color module, the span where value for determining the angle, with being somebody's turn to do from the illumination variation module
The corresponding interval interior extraction brightness stencil value of span.
7. device according to claim 5, it is characterised in that
The shade add module, for subtracting the direction of visual lines and the poor n obtained by the dot-product in vertex normal direction by 1
Power as each pixel shadow factor, wherein, n be not less than 1.
8. device according to claim 5, it is characterised in that the illumination and angle determining module include illumination and angle
Computing module and illumination and angle modular converter；
The illumination and angle calcu-lation module, in the space of summit, calculating the per-vertex lighting on each summit of image to be rendered
Value, the angle in the direction of illumination on each summit and vertex normal direction, the direction of visual lines on each summit and vertex normal direction
Angle；
The illumination and angle modular converter, in pixel space, according to the per-vertex lighting value on each summit, it is determined that
The per-vertex lighting value of each pixel of image to be rendered, according to the direction of illumination on each summit and vertex normal direction
Angle, determines the direction of illumination and the angle in vertex normal direction of each pixel of image to be rendered, according to each top
The direction of visual lines of point and the angle in vertex normal direction, determine the direction of visual lines and vertex scheme of each pixel of image to be rendered
The angle in line direction.
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| CN107316337B (en) * | 2016-04-20 | 2020-11-10 | 网易（杭州）网络有限公司 | Vertex normal processing method and device |
| CN106373179B (en) * | 2016-08-29 | 2019-02-26 | 北京像素软件科技股份有限公司 | Illumination scene rendering method |
| CN106408647B (en) * | 2016-09-20 | 2019-03-05 | 广州视睿电子科技有限公司 | A kind of image shade adding method and device |
| CN106780707B (en) * | 2016-11-17 | 2019-08-06 | 腾讯科技（深圳）有限公司 | The method and apparatus of global illumination in simulated scenario |
| JP2019070872A (en) | 2017-10-05 | 2019-05-09 | カシオ計算機株式会社 | Image processing device, image processing method, and program |
| CN107705352B (en) * | 2017-11-01 | 2021-04-06 | 江苏灵动飞扬科技有限公司 | Rendering method and device of automobile model image, vehicle-mounted imaging equipment and automobile |
| CN108090945B (en) * | 2017-11-03 | 2019-08-02 | 腾讯科技（深圳）有限公司 | Object rendering method and device, storage medium and electronic device |
| CN111369676B (en) * | 2018-12-26 | 2023-07-21 | 沈阳美行科技股份有限公司 | Map image processing method and device and vehicle-mounted equipment |
| CN109985384B (en) * | 2019-03-21 | 2022-10-04 | 网易（杭州）网络有限公司 | Method and device for dynamically adjusting map |
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