Snow accumulation and ge neration
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The document discusses techniques for snow accumulation and generation in 3D graphics. It describes using shadow mapping to accumulate snow based on a depth map and vertex lighting calculations. It also covers randomly positioning snow particles and rendering them with point sprites along with particle animation. Fog effects are achieved using GLSL fog shaders.
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Snow accumulation and ge neration
- 1. SNOW ACCUMULATION AND GENERATION Yuanhui
- 2. MAIN PARTS Particle Rendering for Snow Generation Shadow Mapping for Snow Accumulation Fog Effect
- 3. SNOW ACCUMULATION Rendering Depth Map From the view of the sky with orthographic camera Render depth values to texture
- 4. SNOW ACCUMULATION Rendering Object Shadow testing: not exposed when depth larger than depth map value Read depth map value VL = Ms * Mp * Mv * Mm * V VL projected vertex from light source Ms scale matrix (-1, 1) to (0, 1) Mp light source projection Mv light source view from world Mm model to world V vertices
- 5. SNOW ACCUMULATION Incline Coefficient dot(Y, normal) http://http.download.nvidia.com/developer/SDK/Individual_Samples/ DEMOS/Direct3D9/src/SnowAccumulation/Docs/SnowAccumulation.pdf
- 6. SNOW GENERATION Random Position Particles Rendering glEnable(GL_POINT_SPRITE) glEnable(GL_VERTEX_PROGRAM_POINT_SIZE) gl_PointSize GL_POINTS Particle Animation calculate alpha (vertex shader)
- 7. FOG EFFECT http://www.ozone3d.net/tutorials/glsl_fog/p02.php
- 8. REFERENCE http://http.download.nvidia.com/developer/SDK/Indi vidual_Samples/DEMOS/Direct3D9/src/SnowAccu mulation/Docs/SnowAccumulation.pdf https://graphics.stanford.edu/wikis/cs248-11- winter/CS_248%3A_Interactive_Computer_Graphic s?action=AttachFile&do=get&target=OpenGLParticl es.pdf http://www.ozone3d.net/tutorials/glsl_fog http://www.opengl-tutorial.org/intermediate- tutorials/tutorial-16-shadow-mapping/
- 9. THANKS!