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Introduction To Massive Model Visualization
- 1. Introduction to Massive Model Visualization Patrick Cozzi Analytical Graphics, Inc.
- 6. Computer Graphics Background CPU GPU Monitor Vertex Processing Geometry Processing Fragment Processing PCIe Bus Color Depth Stencil
- 8. Example Massive Models Procedurally generated model of Pompeii: ~1.4 billion polygons. Image from [Mueller06]
- 9. Example Massive Models Boeing 777 model: ~350 million polygons. Image from http://graphics.cs.uni-sb.de/MassiveRT/boeing777.html
- 15. View Frustum Culling 0 1 2 3 4 5 0 1 3 4 2 5
- 16. View Frustum Culling 0 1 2 3 4 5 0 1 3 4 2 5
- 28. Discrete LOD Not enough detail up close Too much detail in the distance
- 29. Continuous LOD edge collapse vertex split Image from [Luebke01]
- 32. Hierarchical LOD visit(node) { if (computeSSE(node) < pixel tolerance) { render(node); } else { foreach (child in node.children) visit(child); } } Node Refinement
- 33. Hierarchical LOD
- 34. Hierarchical LOD
- 38. Out-of-Core HLOD visit(node) { if ((computeSSE(node) < pixel tolerance) || (not all children resident)) { render(node); foreach (child in node.children) requestResidency(child); } else { foreach (child in node.children) visit(child); } }
Notes de l'éditeur
- TODO: BV slide?
- Also good stuff for game engines
- 30-60 gig on disk. 12 CDs
- CPU 60% per year to two decades. Main memory and dis access only decreased by 7-10%
- Can be slower than brute force. When?
- Spatial data structures exploit spatial coherence. Visit nodes in front to back order. Useful for early-z and occlusion culling.
- The bounding volume usually has far less geometry. Expensive shaders required to render the object are not generally required to render the bounding volume. When only depth testing is enabled, as is the case when rendering the bounding volume, today’s GPUs use a higher-performance rendering path.
- Solutions: restricted triangles, runtime stitching, skirts