User:Sylvain: Difference between revisions

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The FragmentShader applies a cylinder reflection model to give this tube appearance.
The FragmentShader applies a cylinder reflection model to give this tube appearance.
[[Image:TestTubeActorStreamLines.png|thumb|left]]
[[Image:TestTubeActorStreamLines.png|thumb|left]]
This Shader was programmed in GLSL.


==Streamlines with arrows==
==Streamlines with arrows==

Revision as of 22:34, 31 August 2007

Redesign of VTK

The next version of VTK will support OpenGL 2.0 and GPU Filters. The illustration below shows the new Rendering Pipeline of VTK.

ShaderDeviceAdapter.png

Streamline Visualization on the GPU

Lines are converted to Triangle Strips on the CPU. Then the Vertex Shader orients the triangle strips to face the camera. Finally the Fragment Shader colors the pixels based on the reflection equation on a cylinder. The resulting image can be textured with arrows, text, or numbers to convey additional information.

TubePainter.png

Streamlines with a cylinder reflection model

The Vertex Shader orients the triangle strips toward the camera. The FragmentShader applies a cylinder reflection model to give this tube appearance.

TestTubeActorStreamLines.png

Streamlines with arrows

The Fragment Shader creates a triangle and orients it based on the value of a vertex attribute.

TestArrowTubeActor.png

Streamlines with RGBA texture

The Fragment Shader applies a texture on the streamlines to visualize additional information.

TestTextureTubeActor.png

Streamlines with numbers

Note that the numbers are oriented correctly on the Vertex Shader. The text always faces the camera even during rotations.

TestCellIdAnimation.gif

Close up on the texture of the streamlines.

TestCellIdTubeActor1.png

Streamlines with a varying radius

TestStreamLinesVaryingRadius.png