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Shadow Volumes⇨ Problems? Very fill-rate intensive Calculating shadow volumes can be complex andtime consuming Difficult to extend to soft-shadows⇨ Advantages? Since everything is done in geometry-space instead ofimage-space, no aliasing artifacts!!! No shadow acne either!© Copyright Ian D. Romanick 2009, 2011 9-February-2011
Shadow Volumes – Z-Pass1. Disable depth and color writes2. Configure stencil operation: GL_INCR_WRAP on depth pass front-faces GL_DECR_WRAP on depth pass back-faces GL_KEEP for all other cases3. Draw shadow volumes⇨ Why use GL_INCR_WRAP and GL_DECR_WRAPinstead of GL_INCR and GL_DECR?© 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 20 and 21: Stencil Buffer - ExampleglClearSten
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 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
Page 70 and 71: Half-Edge Mesh⇨ Edges can be adde
Page 76 and 77: Half-Edge Mesh⇨ Relink the edges
Page 82 and 83:
ReferencesMatt Pharr and Ken Schoem
Page 84 and 85:
Shadow Volume Geometry⇨ Once we h
Page 86 and 87:
Fixing Object Geometry⇨ What abou
Page 88 and 89:
Fixing Object Geometry⇨ What abou
Page 90:
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