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Interactive transparency rendering for large CAD models.

Jianbing Huang1, Michael B Carter

  • 1UGS PLM Solutions, 2321 North Loop Drive, Ames, IA 50014, USA. Jianbing.Huang@ugs.com

IEEE Transactions on Visualization and Computer Graphics
|September 8, 2005
PubMed
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This study introduces a novel method for interactive transparency rendering by sorting triangles on the CPU and rendering them on the GPU. This approach enhances realism and visual inspection in engineering visualization.

Area of Science:

  • Computer Graphics
  • Scientific Visualization

Background:

  • Transparency is crucial for realism and visual inspection in computer graphics.
  • Existing methods struggle with interactive rendering of complex scenes with transparency.

Purpose of the Study:

  • To develop an efficient method for interactive transparency rendering of static scenes.
  • To improve visual inspection capabilities in engineering visualization.

Main Methods:

  • A hybrid sorting approach combining Binary Space Partition (BSP) and depth-sort methods on the CPU.
  • Optimized BSP tree construction for reduced time, size, and sorting cost.
  • An improved depth-sort algorithm to handle occlusions without triangle splitting.
  • Leveraging GPU hardware for rendering sorted triangles.

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Main Results:

  • Achieved interactive transparency rendering with a penalty factor of 4-6 for various part types.
  • Demonstrated effectiveness on scenes with up to 1.2 million triangles.
  • Approximation strategies showed practicality for large CAD assemblies (over 16 million triangles).
  • Minimal artifacts produced even with large, complex datasets.

Conclusions:

  • The proposed system offers efficient interactive transparency rendering.
  • The hybrid sorting method balances BSP and depth-sort strengths effectively.
  • The approach is practical for large-scale engineering visualization applications.