Splatting and Texture-Based Volume Rendering

Question 1

What is splatting?

Answer 1

Using kernels for each voxel and projection them onto the image pane.

Question 2

What is the advantages of splatting?

Answer 2

• Decent picture quality
• Fast object-order method
• Efficient processing, only processes non-empty nodes
• Perspective projection possible.

Question 3

What are the disadvantages of splatting?

Answer 3

• Can blur images
• Some artefacts

Question 4

What is texture-based volume rendering?

Answer 4

Visualise volumetric data by using texture mapping onto 3D structures.

Question 5

How does texture-based volume rendering work?

Answer 5

• Volume data is sampled along rays or within slices
• each sample is assigned an intensity
• Textures are blended together to create final image.

Question 6

Why do we rotate the image plane when splatting?

Answer 6

• Reduce artifacts
• Enhanced perception of depth
• Clearer view

Question 7

What is the process of texture-based volume rendering?

Answer 7

• Preproccesing, 3D texture is loaded onto the GPU
• Rendering, volume is sliced into a series of 2D textures
• Composition, back-to-front

Question 8

What are the advantages of texture-based volume rendering?

Answer 8

• Efficiency, ultilises GPU for fast rendering
• High quality

Question 9

What is the process of splatting?

Answer 9

1. For each slice of object, project kernels onto a temporary buffer. The kernel colour could be calculated by the gradient of the voxel
2. Merge each buffer onto an intermediate image pane
3. Stretch image based off the position of the viewpoint