Direct interval volume rendering

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.