overview of 3d object representation
Post on 31-Dec-2015
70 Views
Preview:
DESCRIPTION
TRANSCRIPT
Overview of 3D Object Representation
3D Object Representation: Surfaces vs. Solids
Surfaces – Mesh
• Group of connected polygons (usually triangles)– May not be closed
Surfaces – Subdivision Surface
• Coarse mesh & subdivision rule– Define smooth surface as limit of sequence of
refinements
Zorin & SchroederSIGGRAPH99 course notes
Surfaces – Parametric Surface
• Tensor product spline patches– Careful constraints to maintain continuity
FvDFH Figure 11.44
Surfaces – Implicit Surface
• Points satisfying F(x,y,z) = 0
Bill Lorensen SIGGRAPH 99 Course #4 Notes
Solids – Voxels
• Uniform grid of volumetric samples– Acquired from CAT, MRI etc.
Solids – BSP Tree
• Binary space partition with solid cells labelled– Constructed from polygonal representations
Solids – CSG
• Hierarchy of boolean set operations (union, difference, intersect) applied to simple shapes
top related