求问怎样让有贴图的3ds模型产生阴影

joven0

我已经实现导入3ds模型文件，但是我一加阴影，3ds模型的贴图就都不显示，变成一个空洞的白色模型，请问有没有做过阴影方面算法的人，帮助我解决一下。 [em24]，下面是我渲染函数：

1. void renderScene(void)
   
2. {
   
3. if(Shadows)
   
4. { printf("%d\n",temp1++);
   
5. p_light[0] = light_mvnt * cos(lightangle/2000.0);
   
6. p_light[2] = light_mvnt * sin(lightangle/2000.0);//用来移动光源
   
7. //First step: Render from the light POV to a FBO, story depth values only
   
8. 
   
9. glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,fboId); //激活帧缓冲区fboId，下面的渲染都在fboId中进行
   
10. //不用着色器，换句话说就是用固定管线
    
11. glUseProgramObjectARB(0);
    
12. // In the case we render the shadowmap to a higher resolution, the viewport must be modified accordingly.
    
13. 
    
14. glViewport(0 , 0 , WINDOW_WIDTH * SHADOW_MAP_RATIO , WINDOW_HEIGHT* SHADOW_MAP_RATIO); // Clear previous frame values glClear( GL_DEPTH_BUFFER_BIT); //Disable color rendering, we only want to write to the Z-Buffer glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); setupMatrices(p_light[0],p_light[1],p_light[2],l_light[0],l_light[1],l_light[2]); // Culling switching, rendering only backface, this is done to avoid self-shadowing
    
15. glCullFace(GL_FRONT);
    
16. glEnable(GL_POLYGON_OFFSET_FILL);
    
17. glPolygonOffset(8.0f,1.0f);
    
18. drawObjects(GL_FALSE,GL_FALSE,2);
    
19. glDisable(GL_POLYGON_OFFSET_FILL); //Save modelview/projection matrice into texture7, also add a bias
    
20. 
    
21. setTextureMatrix(); // Now rendering from the camera POV, using the FBO to generate shadows
    
22. 
    
23. glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,0);//关闭帧缓冲区，下面的代码在即将刷新到屏幕的缓冲区中绘制 }
    
24. 
    
25. glViewport(0,0 , WINDOW_WIDTH , WINDOW_HEIGHT);
    
26. 
    
27. glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); // Clear previous frame values
    
28. 
    
29. glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    
30. if (Shadows)
    
31. {
    
32. //Using the shadow shader
    
33. glUseProgramObjectARB(shadowShaderId);
    
34. glUniform1iARB(shadowMapUniform,7);
    
35. glUniform1fARB(shadowMapStepXUniform , 1.0/ (WINDOW_WIDTH * SHADOW_MAP_RATIO)); glUniform1fARB(shadowMapStepYUniform , 1.0/ (WINDOW_HEIGHT * SHADOW_MAP_RATIO)); glActiveTextureARB(GL_TEXTURE7);
    
36. glBindTexture(GL_TEXTURE_2D,textures[SHADOWTEXTURE]);
    
37. glEnable(GL_TEXTURE_2D);
    
38. glActiveTextureARB(GL_TEXTURE0);
    
39. glEnable(GL_TEXTURE_2D);
    
40. } setupMatrices(p_camera[0],p_camera[1],p_camera[2],l_camera[0],l_camera[1],l_camera[2]); //实际只是进行了设置视点位置和方向
    
41. //用于设置环境光和散射光
    
42. GLfloat ambientLight[]={ 1.0f , 1.0f , 1.0f , 1.0f };
    
43. glEnable(GL_LIGHTING);
    
44. glLightModelfv(GL_LIGHT_MODEL_AMBIENT,ambientLight);
    
45. glEnable(GL_COLOR_MATERIAL);
    
46. glColorMaterial(GL_FRONT,GL_AMBIENT_AND_DIFFUSE);
    
47. glCullFace(GL_BACK);
    
48. //glEnable(GL_BLEND);
    
49. //glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    
50. drawObjects(GL_TRUE,GL_FALSE,2);
    
51. glutSwapBuffers();
    
52. }

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