direct interval volume rendering
DESCRIPTION
A summary of the Vis paper, "Direct Interval Volume Visualization."TRANSCRIPT
Direct Interval Volume Visualization
Vis2010
2011/05/11ked
Authors
Marco Ament, Daniel Weiskopf, Hamish Carr
Outline
Introduction Traditional volume rendering Pre-integrated volume rendering Interval volume traversal Results
Outline
Introduction Traditional volume rendering Pre-integrated volume rendering Interval volume traversal Results
Volume rendering
“Volume rendering is a technique used to display a 2D projection of a 3D discretely sampled data set.” – wiki
Transfer function — classification
intensity
density
color
opacity
Interval volume
Scale-invariant opacity
Comparison
Outline
Introduction Traditional volume rendering Pre-integrated volume rendering Interval volume traversal Results
Optical model
Optical model
Optical model
Numerical solution
Numerical solution
frequency along a ray = frequency in source data x frequency in transfer function
Outline
Introduction Volume rendering Pre-integrated volume rendering Interval volume traversal Results
Cell interpolation
cell
Function reconstruction
cubic polynomial
Linear subsegment
cubic polynomial
frequency along a ray = frequency in source data x frequency in transfer function
Pre-integrated volume rendering
Compositing
Outline
Introduction Volume rendering Pre-integrated volume rendering Interval volume traversal Results
Example
Interval volume
Interval volume traversal
Interval volume traversal – 1
Interval volume traversal – 2
Interval volume traversal – 3
Interval volume traversal – 4
Interval volume traversal – 5
Opacity correction
compositing
Outline
Introduction Volume rendering Pre-integrated volume rendering Interval volume traversal Results
Results
Results
Improper sapling opacity too much
Interval volume
Results
Thx.