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Stencil Buffer – ExampleglClearStencil(0);glClear(GL_STENCIL_BUFFER_BIT);glEnable(GL_STENCIL_TEST);// Write 1 to stencil where polygon is drawn.glStencilFuncSeparate(GL_FRONT_AND_BACK, GL_ALWAYS, 1, ~0);glStencilOpSeparate(GL_FRONT_AND_BACK,GL_KEEP, GL_KEEP, GL_REPLACE);draw_some_polygon();// Draw scene only where stencil buffer is 1.glStencilFuncSeparate(GL_FRONT_AND_BACK, GL_EQUAL, 1, ~0);glStencilOpSeparate(GL_FRONT_AND_BACK,GL_KEEP, GL_KEEP, GL_KEEP);draw_scene();© Copyright Ian D. Romanick 2009, 2011 9-February-2011
Stencil Buffer – Window System⇨ Stencil buffer is often stored interleaved withdepth buffer 8-bit stencil with 24-bit depth is most common Other combinations such as 1-bit stencil with 15-bitdepth do exist (very, very rare these days)⇨ Must request a stencil buffer with your window With SDL, this means setting the stencil size attributeto the minimum number of stencil bits requiredSDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 4);© Copyright Ian D. Romanick 2009, 2011 9-February-2011
Page 4 and 5: Stencil BufferglStencilFuncSeparate
Page 10 and 11: Stencil Operation⇨ Stencil buffer
Page 12 and 13: Stencil BufferglStencilOpSeparate(G
Page 18 and 19: Stencil Buffer⇨ Stencil buffer ca
Page 22 and 23: Stencil Buffer - FBOs⇨ Stencil bu
Page 24 and 25: Stencil Buffer - FBO ExampleglGenFr
Page 26 and 27: Shadow Volumes⇨ Proposed by Frank
Page 28 and 29: Shadow Volumes⇨ Basic algorithm:1
Page 30 and 31: Shadow Volumes⇨ Problems? Very
Page 32 and 33: Shadow Volumes⇨ Problems? Very
Page 34 and 35: Shadow Volumes - Z-Pass1. Disable d
Page 36 and 37: Shadow Volumes - Z-Pass⇨ Big prob
Page 38 and 39: Shadow Volumes - Z-Pass⇨ Big prob
Page 40 and 41: Shadow Volumes - Z-Fail1. Disable d
Page 42 and 43: Shadow Volumes - Z-Fail⇨ Big prob
Page 44 and 45: Shadow Volumes⇨ Front and back ca
Page 46 and 47: Shadow Volumes⇨ Advantages? Sha
Page 48 and 49: Shadow Volume Geometry⇨ Generatin
Page 50 and 51: Winged-Edge Mesh⇨ The original me
Page 52 and 53: Winged-Edge Mesh⇨ Desirable mesh
Page 54 and 55: Half-Edge Mesh⇨ Slight modificati
Page 56 and 57: Half-Edge Meshstruct half_edge {//
Page 58 and 59: Half-Edge Mesh⇨ If each HE only s
Page 60 and 61: Half-Edge Mesh⇨ Given a vertex st
Page 62 and 63: Half-Edge Meshe>siblingf 0f 1v©
Page 64 and 65: Half-Edge Mesh⇨ What's the proble
Page 66 and 67: Half-Edge Mesh⇨ How can we add ne
Page 68 and 69: Half-Edge Mesh⇨ To make the HE wo
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Half-Edge Mesh⇨ Edges can be adde
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Half-Edge Mesh⇨ Relink the edges
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ReferencesMatt Pharr and Ken Schoem
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Shadow Volume Geometry⇨ Once we h
Page 86 and 87:
Fixing Object Geometry⇨ What abou
Page 88 and 89:
Fixing Object Geometry⇨ What abou
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Legal StatementThis work represents
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