Image Based Methods of Terrain Rendering Reimar Schubert and A' James Stewart Department of Computer

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Image Based Methods of Terrain RenderingReimar
Schubert and A. James StewartDepartment of
Computer Science, University of Toronto

View Dependent Textured Meshes
Spectrum of Rendering Methods
Advantages
MESH BASED
Full Geometry
View Dependent Unzipped Mesh
Project textured mesh back into world space
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LOD Mesh (lifted textures)
View dependent textured mesh
Project terrain onto plane perpendicular to
viewpoint
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View Dependent Textured Mesh
Disadvantages
LOD Mesh w/ Lifted Textures
BILLBOARD BASED
Jags
Create mesh on image plane
Filter for depth discontinuities
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No disocclusions
Multiple Internal Billboards w/ Warping
External Meshed Billboard w/ Warping
Unzipped Meshes
Sprites with Depth
Texture Mapped Billboard
Ordered by quality
Preliminary Work
In progress generate new triangles to fill in
disocclusions
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Generate image and mesh as before
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Sprites with Depth
Very slow to warp individual pixels
Holes in final warped image
External Meshed Billboard w/ Warping
No disocclusions
Depth discontinuity artifacts (jags)
Found to be equivalent to view dependent textured
meshes (see above)
Unzip mesh at partition edges
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Partition mesh by depth
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