CN1750046A - Three-dimensional ink and wash effect rendering method based on graphic processor - Google Patents
Three-dimensional ink and wash effect rendering method based on graphic processor Download PDFInfo
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Abstract
The present invention discloses 3D ink and wash effect rendering method based on graphic processor. Graphic processor is utilized to provide programmable streamline for classifying common objects in Chinese landscape painting. The ink and wash effect rendering method for multipeaked mountain, cloud sea, waterfall and trees is proposed to realize the motion of dynamic objects, such as cloud sea and waterfall, in scene and the treatment of the boundary between dynamic object and static object. The method of the present invention maintains the ink and wash style characteristic of the said objects in 3D environment effectively, expresses the motion of dynamic objects and reaches real-time rendering effect.
Description
Technical field
The present invention relates to a kind of graph rendering, relate in particular to graphic process unit (Graphics Processing Unit, three-dimensional ink and wash effect rendering method GPU).
Background technology
It is that three-dimensional model is played up the handwritten drawings effect that purpose is played up in three-dimensional stylization, has widespread use value at animation and field of play.At present most of three-dimensional stylized rendering system mainly relies on CPU to calculate, play up for some simple painting effects and can reach real-time, then can't reach in real time but the complicated painting effect that more is rich in expressive force played up, cause many complicated stylizations to play up and to be applied to occasions in real time such as three-dimensional stylization recreation and three-dimensional stylized virtual environment roaming.In the cartoon making field, play up a width of cloth picture at present and on average use 10 minutes, if can carry out real-time rendering, then can improve the animation rendering efficiency greatly, reduce the cartoon making cost.
Recent years is because the fast development of GPU technology, there are many people to begin to utilize GPU to quicken the research work of 3 D image drawing aspect, but great majority are still towards photo realism graphic and draw at present, has only small part towards non-photorealistic rendering, as mechanical schematic, pen-and-ink drawing, shadow tone, point is carved and the cartoon effect is played up etc.
Summary of the invention
The purpose of this invention is to provide a kind of three-dimensional ink and wash effect rendering method based on graphic process unit, the programmable flow waterline that provides by GPU combines the dirigibility of software with the hardware speed of GPU, the three-dimensional model real-time rendering is become Chinese ink painting's effect.
To achieve these goals, technical solution of the present invention is that the programmable flow waterline that utilizes GPU to provide is classified to familiar object in the Chinese landscape painting, and the ink and wash effect rendering method of the proposition chain of mountains, sea of clouds, waterfall and trees, in order to keep the ink and wash style feature, the disposal route to dynamic object in the scene such as sea of clouds, waterfall and stationary body such as chain of mountains juncture area is proposed.
The inventive method may further comprise the steps:
1. utilize input instruction input model of place and ink and wash style texture storehouse;
2. play up based on the multilayer ink and wash style chain of mountains of ink and wash style texture array;
3. play up based on the ink and wash style sea of clouds of displacement map method;
4. play up based on the ink and wash style waterfall of texture movement technique;
5. play up based on the ink and wash style trees of Billboard method;
6. animated video output.
The above-mentioned input instruction that utilizes is imported model of place and ink and wash style texture storehouse, comprises the steps:
1) input constitutes the three-dimensional model of the chain of mountains, sea of clouds, waterfall and the trees of scene, and wherein chain of mountains model has multilayer, the corresponding distant view chain of mountains, the middle Jingshan mountain mountains in a range and the close shot chain of mountains;
2) input ink and wash style texture storehouse comprises chain of mountains texture array in the texture storehouse, the sea of clouds texture, and waterfall texture, trunk texture and leaf texture, wherein chain of mountains texture array has 3 row, 4 row, and the wherein capable corresponding different levels chain of mountains is listed as corresponding different luminance brightness.
The above-mentioned multilayer ink and wash style chain of mountains based on ink and wash style texture array is played up, and comprises the steps:
1) reads multilayer chain of mountains model and chain of mountains texture array;
2) utilize normal vector textured image to extract chain of mountains model silhouette line and surperficial Zhe line, it is carried out carrying out antialiased rendition again after the expansion process with the pixel coloring device among the GPU;
3) detect the place layer position of chain of mountains model in three-dimensional scenic, in chain of mountains texture array, call the ink and wash style texture of equivalent layer and be mapped on the chain of mountains model with the pixel coloring device of GPU;
4) obtain the artistic illumination information of the ink and wash chain of mountains according to statistical method, this information is combined with traditional illumination model obtains artistic illumination model, determines the light and shade of the chain of mountains behind mapping texture with it;
5) determine the atomizing zone of chain of mountains model bottom and sea of clouds contact portion, it carries out the Alpha transition and desalinates processing to chain of mountains water wave reason and sea of clouds texture with the pixel coloring device of GPU in this zone.
The above-mentioned ink and wash style sea of clouds based on the displacement map method is played up, and comprises the steps:
1) reads sea of clouds model and sea of clouds texture;
2) in the vertex shader of GPU sinusoidal perturbation is at random carried out with the displacement map method in the summit on the sea of clouds model, the control vertex texture coordinate changes in time simultaneously;
3) detect chain of mountains model in sea of clouds model intersection location, determine bottom transition desalination scope;
4) constitute 25 * 25 pixel Gaussian filters with horizontal, vertical gaussian filtering multiplication, Fuzzy Processing is carried out in transition desalination zone, chain of mountains bottom with it;
5) in the pixel coloring device of GPU, in the chain of mountains bottom sea of clouds texture and chain of mountains texture are carried out transition desalination processing with the Alpha fusion.
The above-mentioned ink and wash style waterfall based on the texture movement technique is played up, and comprises the steps:
1) reads waterfall model and waterfall texture;
2) traditional Chinese Painting style waterfall texture is hinted obliquely at waterfall place curved surface;
3) move from the top down with texture movement technique control waterfall texture coordinate in the vertex shader of GPU, laterally remain unchanged, the texture coordinate movement velocity is adjustable;
4) make up two arrowband models separately in the waterfall model left and right edges, carry out transition desalination processing with the relative texture coordinate on the arrowband model as Alpha passage waterfall ink and wash style texture and chain of mountains ink and wash style texture, need the position that waterfall ink and wash style texture and chain of mountains ink and wash style texture are carried out Alpha transition desalination processing in the waterfall model bottom.
The above-mentioned ink and wash style trees based on the Billboard method are played up, and comprise the steps:
1) reads the trunk model, trunk texture, leaf model and leaf texture;
2) utilize normal vector textured image to extract the outline line and the surperficial Zhe line of trunk model, in the pixel coloring device of GPU, it is carried out carrying out antialiased rendition again after the expansion process;
3) traditional Chinese Painting trunk texture is hinted obliquely on the trunk model;
4) according to leaf towards, the deep or light relation in position and front and back different leaf Texture classification, draw leaf with the Billboard method.
Three-dimensional ink and wash effect rendering method based on graphic process unit of the present invention has following beneficial effect:
1) to familiar object classification in the landscape painting, the chain of mountains of proposition, sea of clouds, waterfall and trees rendering intent have kept the ink and wash style feature of these objects effectively in three-dimensional environment.
2) motion that the disposal route of dynamic object in the scene such as sea of clouds, waterfall and stationary body such as chain of mountains juncture area had both been showed dynamic object has kept their ink and wash style feature again.
3) play up speed and reach real-time.
Description of drawings
Fig. 1 is the system chart that is used to realize the inventive method;
Fig. 2 is the three-dimensional ink and wash effect rendering method process flow diagram that the present invention is based on graphic process unit;
Fig. 3 is that the multilayer ink and wash style chain of mountains based on ink and wash style texture array among the present invention is played up process flow diagram;
Fig. 4 is that the ink and wash style sea of clouds based on the displacement map method among the present invention is played up process flow diagram;
Fig. 5 is that the ink and wash style waterfall based on the texture movement technique among the present invention is played up process flow diagram;
Fig. 6 is that the ink and wash style trees based on the Billboard method among the present invention are played up process flow diagram.
Embodiment
Be used to realize the system of the inventive method, as shown in Figure 1, it comprises: three-dimensional object model input interface 100, and stylized texture storehouse 110 divides type objects to play up 120, graphic process unit (GPU) 130 and animated video output 140, wherein, divide type objects to play up 120 and comprise that the chain of mountains plays up 121, sea of clouds plays up 122, waterfall plays up 123, and trees play up 124.
Three-dimensional ink and wash effect rendering method flow process based on graphic process unit of the present invention as shown in Figure 2, this flow process successively as follows:
1. utilize input instruction input model of place and ink and wash style texture storehouse;
2. play up based on the multilayer ink and wash style chain of mountains of ink and wash style texture array;
3. play up based on the ink and wash style sea of clouds of displacement map method;
4. play up based on the ink and wash style waterfall of texture movement technique;
5. play up based on the ink and wash style trees of Billboard method;
6. animated video output.
Below in conjunction with the example in detail above-mentioned steps.
Step 1 is utilized input instruction input model of place and ink and wash style texture storehouse, passes through to realize at three-dimensional object model input interface 100 and stylized texture storehouse 110 in system.
The three-dimensional object model input interface 100 corresponding branch type objects chain of mountains, sea of clouds, waterfall and trees utilize input command just can import the object model of corresponding class.
The classification object texture that prestores in the stylization texture storehouse 110 is followed the corresponding class texture input of input command.
The classification object texture that prestores comprises:
Chain of mountains stylization texture array, totally 3 row 4 are listed as, and the wherein capable corresponding different levels chain of mountains is listed as corresponding different luminance brightness.In this example, each texture cell in the chain of mountains texture array is 256 * 256 pixels;
Sea of clouds stylization texture, its size will cover design scenario, is 3200 * 1200 pixels in this example;
Waterfall stylization texture is got 140 * 800 pixels at this example;
Trunk stylization texture is got 130 * 180 pixels in this example;
Leaf stylization texture is got 80 * 60 pixels in this example.
Step 2 is played up flow process as shown in Figure 3 based on the multilayer ink and wash style chain of mountains of ink and wash style texture array, and it comprises the steps:
1) reads chain of mountains model and chain of mountains texture array.System reads multilayer chain of mountains model and chain of mountains texture array, and multilayer chain of mountains model is by the distant view chain of mountains, and the middle Jingshan mountain mountains in a range and the close shot chain of mountains constitute.Chain of mountains texture array has 3 row 4 row, the corresponding distant view chain of mountains of first row wherein, and Jingshan mountain mountains in a range in the second row correspondence, the corresponding close shot chain of mountains of the third line is listed as corresponding different luminance brightness.
2) draw normal vector textured image.The normal vector information of model is depicted as the drafting normal vector textured image.
3) extract outline line and surperficial pleat line.Utilize the background color in the normal direction texture image to extract body outline earlier, utilize modelling vector angle size to extract surperficial pleat line again.
4) expansion and anti-aliasing.Utilize the pixel coloring device among the GPU to finish expansion and anti-aliasing processing.
5) detect the multilayer chain of mountains and shine upon respective texture.Utilize the GPU pixel coloring device to detect layer position, chain of mountains place, call respective layer chain of mountains texture and be mapped to being mapped on the mountains in a range model.
6) artistic photo-irradiation treatment.According to the artistic luminance brightness that given style sample statistics is obtained along chain of mountains height change curve.This curve preparation method is as follows: in the chain of mountains sample of handwritten drawings along height equidistant some sample strips, average brightness value of calculating sampling band then got on massif of massif.The luminance brightness of drawing is along the variation relation curve of mountain height.This curve and traditional illumination model are weighted stack, and the weight of stack determines to be respectively 0.6 and 0.4 at last according to test.The precipitous degree of the chain of mountains utilizes the dot product of the normal vector of the Up vector of chain of mountains model and body surface to be similar to, and obtains the precipitous luminance brightness figure of the chain of mountains, further relatively stack result figure and the precipitous luminance brightness figure in chain of mountains surface, get brightness value low be final brightness values.
7) desalination of chain of mountains bottom is handled.Chain of mountains bottom treatment is reference with chain of mountains model bottom, and 0.2 times of upwards getting chain of mountains model height is regional as the atomizing of chain of mountains bottom, with this atomization parameter is set highly, in the atomizing zone cloud and mist texture is carried out Alpha with chain of mountains texture and mixes.
Step 3 is played up flow process as shown in Figure 4 based on the ink and wash style sea of clouds of displacement map method, and it comprises the steps:
1) reads sea of clouds model and sea of clouds texture.Read three-dimensional sea of clouds model and sea of clouds ink and wash style texture.
2) to sea of clouds model vertices random perturbation.In the vertex shader of GPU, model vertices is carried out sinusoidal perturbation at random with the displacement map method.If TexCrd (u v) is the vertex texture coordinate, u wherein, and v is the texture coordinate space variable, DirX and DirY two inceptive directions for setting, then the initial disturbance direction InitDir on this summit is:
InitDir＝DirX×TexCrd.u+DirY×TexCrd.v
3) make the vertex texture coordinate change in time.Utilize in the vertex shader of GPU the vertex texture coordinate is carried out cyclical variation in time.
4) determine bottom desalination scope according to chain of mountains position, the zone of it being played up a white is kept in the render target buffer zone.
5) making up Gaussian filter blurs the desalination scope.The weights computing formula of Gaussian Blur is decomposed into the long-pending of horizontal direction and two weights of vertical direction:
＝g
1D(x)·g
1D(y)
G wherein
2D(x, y) be (x, the y) weights of pixel, σ are the Gaussian Blur standard radius, x.y is the coordinate of relative center pixel, g
1D(x) be the horizontal direction weights, g
2D(y) be the weights of vertical direction.The two multiply each other the Gaussian Blur device that obtains 25 * 25 pixels and to 4) in white portion carry out Gaussian Blur.
6) fuzzy region sea of clouds texture and chain of mountains texture merge.Alpha value and the chain of mountains of sea of clouds texture color value after fuzzy as this zone sea of clouds pixel is merged.
Step 4 is played up flow process as shown in Figure 5 based on the ink and wash style waterfall of texture movement technique, and it comprises the steps:
1) reads waterfall model and waterfall texture.Read three-dimensional waterfall model and waterfall ink and wash style texture.
2) the waterfall texture coordinate moves.Ink and wash style waterfall texture is hinted obliquely at waterfall place curved surface, in the GPU vertex shader, make the waterfall texture coordinate move from the top down, laterally remain unchanged.
3) the waterfall left hand edge is handled.The waterfall left hand edge is cut out a fillet, and its width is 0.15 times of waterfall width, and their horizontal direction texture coordinate is set as from 0 to 1 linear change, in the GPU pixel coloring device massif texture and waterfall texture is carried out Alpha as parameter and mixes.
4) the waterfall right hand edge is handled.The waterfall right hand edge is respectively cut out a fillet, and its width is 0.15 times of waterfall width, and their horizontal direction texture coordinate is set as from 1 to 0 linear change, in the GPU pixel coloring device massif texture and waterfall texture is carried out Alpha as parameter and mixes.
5) waterfall bottom treatment.With the waterfall model bottom is reference, upwards gets 0.25 times of desalination zone as the waterfall bottom of waterfall model height, carries out Alpha according to waterfall vertical direction texture coordinate and merges.
Step 5 is played up flow process as shown in Figure 6 based on the ink and wash style trees of Billboard method, and it comprises the steps:
1) reads trunk model and trunk, leaf texture.Read three-dimensional trunk model, trunk texture, Bollboard leaf model and leaf texture.
2) draw the trunk outline line.The normal vector information drafting pattern picture of trunk model, utilize the background color in the normal direction texture image to extract body outline then, and it is expanded and anti-aliasing processing.
3) mapping trunk texture.Ink trunk texture is hinted obliquely on the trunk model.
4) leaf Texture classification.According to leaf towards, the deep or light relation in position and front and back the leaf Texture classification.
5) leaf is drawn.With the Billboard method leaf texture is hinted obliquely on the Bollboard leaf model.
Step 6 animated video output, according to standard A VI form the real-time output video animation of playing up of ink and wash effect scene.
The GPU that the present invention uses is ATI 9800 graphic process unit, and realizes based on Direct3D 9.0 on the PC platform.
Claims (6)
1. based on the three-dimensional ink and wash effect rendering method of graphic process unit, may further comprise the steps:
1) utilizes input instruction input model of place and ink and wash style texture storehouse;
2) play up based on the multilayer ink and wash style chain of mountains of ink and wash style texture array;
3) play up based on the ink and wash style sea of clouds of displacement map method;
4) play up based on the ink and wash style waterfall of texture movement technique;
5) play up based on the ink and wash style trees of Billboard method;
6) animated video output.
2. according to the described method of claim 1, it is characterized in that said input instruction input model of place and the ink and wash style texture storehouse of utilizing, comprise the steps:
A, input constitute the three-dimensional model of the chain of mountains, sea of clouds, waterfall and the trees of scene, and wherein chain of mountains model has multilayer, the corresponding distant view chain of mountains, the middle Jingshan mountain mountains in a range and the close shot chain of mountains;
B, input ink and wash style texture storehouse comprise chain of mountains texture array in the texture storehouse, the sea of clouds texture, and waterfall texture, trunk texture and leaf texture, wherein chain of mountains texture array has 3 row, 4 row, and the wherein capable corresponding different levels chain of mountains is listed as corresponding different luminance brightness.
3. according to the described method of claim 1, it is characterized in that the said multilayer ink and wash style chain of mountains based on ink and wash style texture array plays up, comprise the steps:
A, read multilayer chain of mountains model and chain of mountains texture array;
B, utilize normal vector textured image to extract chain of mountains model silhouette line and surperficial Zhe line, it is carried out carrying out antialiased rendition again after the expansion process with the pixel coloring device in the graphic process unit;
C, detect the place layer position of chain of mountains model in three-dimensional scenic, in chain of mountains texture array, call the ink and wash style texture of equivalent layer and be mapped on the chain of mountains model with the pixel coloring device of graphic process unit;
D, obtain the artistic illumination information of the ink and wash chain of mountains according to statistical method, this information is combined with traditional illumination model obtains artistic illumination model, determines the light and shade of the chain of mountains behind mapping texture with it;
E, determine the atomizing zone of chain of mountains model bottom and sea of clouds contact portion, it carries out the Alpha transition and desalinates processing to chain of mountains water wave reason and sea of clouds texture with the pixel coloring device of graphic process unit in this zone.
4. according to the described method of claim 1, it is characterized in that said ink and wash style sea of clouds based on the displacement map method plays up, comprise the steps:
A, read sea of clouds model and sea of clouds texture;
B, in the vertex shader of graphic process unit sinusoidal perturbation is at random carried out with the displacement map method in the summit on the sea of clouds model, the control vertex texture coordinate changes in time simultaneously;
C, detection chain of mountains model are determined bottom transition desalination scope in sea of clouds model intersection location;
D, with laterally, vertical gaussian filtering multiplication constitutes 25 * 25 pixel Gaussian filters, with it Fuzzy Processing carried out in transition desalination zone, chain of mountains bottom;
E, in the pixel coloring device of graphic process unit, merge and in the chain of mountains bottom sea of clouds texture and chain of mountains texture are carried out transition and desalinate processing with Alpha.
5. according to the described method of claim 1, it is characterized in that said ink and wash style waterfall based on the texture movement technique plays up, comprise the steps:
A, read waterfall model and waterfall texture;
B, ink and wash style waterfall texture is hinted obliquely at waterfall place curved surface;
C, move from the top down with texture movement technique control waterfall texture coordinate in the vertex shader of graphic process unit, laterally remain unchanged, the texture coordinate movement velocity is adjustable;
D, make up two arrowband models separately in the waterfall model left and right edges, carry out transition desalination processing with the relative texture coordinate on the arrowband model as Alpha passage waterfall ink and wash style texture and chain of mountains ink and wash style texture, need the position that waterfall ink and wash style texture and chain of mountains ink and wash style texture are carried out Alpha transition desalination processing in the waterfall model bottom.
6. according to the described method of claim 1, it is characterized in that said ink and wash style trees based on the Billboard method play up, comprise the steps:
A, read the trunk model, trunk texture, leaf model and leaf texture;
The outline line and the surperficial Zhe line of b, extraction trunk model carry out carrying out antialiased rendition again after the expansion process to it in the pixel coloring device of graphic process unit;
C, ink trunk texture is hinted obliquely on the trunk model;
D, according to leaf towards, the deep or light relation in position and front and back different leaf Texture classification, draw leaf with the Billboard method.
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