Direct Rendering of Solid CAD Models on the GPU

Hanniel, Iddo; Haller, Kirk

doi:10.1109/cad/graphics.2011.63

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…For example, direct rendering of solid CAD models by GLSL (OpenGL Shading Language) is employed to achieve pixel level quality and less memory requirements [17]. But each surface type needs a fragment shader and the tangencies are not handled well.…”

Section: B Gpu Accelerated Renderingmentioning

confidence: 99%

GPU Based Compression and Rendering of Massive Aircraft CAD Models

Dunming

Zhao

2012

2012 International Conference on Virtual Reality and Visualization

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The total size of massive aircraft CAD models is usually up to several GBs, which exceed not only the storage capacity of memory, but also the rendering ability of graphics card. In this paper, we present compression and rendering methods by exploring the up-to-date GPU techniques. To fit into the memory, vertex data are compressed from float to byte type with bounding box information and then decompressed with GPU. Index data are in short or byte type according to the vertex size, while normal data are deleted and generated by GPU while rendering. To render in real-time, vertex buffer object is exploited instead of traditional display list for efficiency and GPU occlusion query culls occluded parts to lower the rendering load. Furthermore, deliberately designed GPU shaders are applied to optimize the traditional rendering pipeline. The experiment results show by the GPU based methods, the compression rates get up to 5.3, massive CAD models such as the regional jet can be compressed within 178 MB and fit into memory of personal computers, and the rendering frame rates achieve up to 40 with cheap graphics card. It's proved that our method maximizes the GPU capabilities to accelerate the real-time rendering performance of massive aircraft CAD models.

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Section: B Gpu Accelerated Renderingmentioning

confidence: 99%

GPU Based Compression and Rendering of Massive Aircraft CAD Models

Dunming

Zhao

2012

2012 International Conference on Virtual Reality and Visualization

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“…These are represented internally in the CAD system using analytic surfaces rather than NURBS, since they can be easily manipulated by the solid modeling kernel and can be stored in a compact manner. Hanniel & Haller (2011) performed a detailed survey of over 3, 000 SolidWorks models and concluded that more than 90% of the B-rep surfaces were analytic surfaces. Converting these surfaces to NURBS in order to perform analysis usually leads to poorly parameterized NURBS surfaces and can lead to poorly trimmed or missing surface features.…”

Section: Introductionmentioning

confidence: 99%

Rapid B-rep model preprocessing for immersogeometric analysis using analytic surfaces

Wang

Hsu

et al. 2017

Computer Aided Geometric Design

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Computational fluid dynamics (CFD) simulations of flow over complex objects have been performed traditionally using fluid-domain meshes that conform to the shape of the object. However, creating shape conforming meshes for complicated geometries like automobiles require extensive geometry preprocessing. This process is usually tedious and requires modifying the geometry, including specialized operations such as defeaturing and filling of small gaps. Hsu et al. (2016) developed a novel immersogeometric fluid-flow method that does not require the generation of a boundary-fitted mesh for the fluid domain. However, their method used the NURBS parameterization of the surfaces for generating the surface quadrature points to enforce the boundary conditions, which required the B-rep model to be converted completely to NURBS before analysis can be performed. This conversion usually leads to poorly parameterized NURBS surfaces and can lead to poorly trimmed or missing surface features. In addition, converting simple geometries such as cylinders to NURBS imposes a performance penalty since these geometries have to be dealt with as rational splines. As a result, the geometry has to be inspected again after conversion to ensure analysis compatibility and can increase the computational cost. In this work, we have extended the immersogeometric method to generate surface quadrature points directly using analytic surfaces. We have developed quadrature rules for all four kinds of analytic surfaces: planes, cones, spheres, and toroids. We have also developed methods for performing adaptive quadrature on trimmed analytic surfaces. Since analytic surfaces have frequently been used for constructing solid models, this method is also faster to generate quadrature points on real-world geometries than using only NURBS surfaces. To assess the accuracy of the proposed method, we perform simulations of a benchmark problem of flow over a torpedo shape made of analytic surfaces and compare those to immersogeometric simulations of the same model with NURBS surfaces. We also compare the results of our immersogeometric method with those obtained using boundary-fitted CFD of a tessellated torpedo shape, and quantities of interest such as drag coefficient are in good agreement. Finally, we demonstrate the effectiveness of our immersogeometric method for high-fidelity industrial scale simulations by performing an aerodynamic analysis of a truck that has a large percentage of analytic surfaces. Using analytic surfaces over NURBS avoids unnecessary surface type conversion and significantly reduces model-preprocessing time, while providing the same accuracy for the aerodynamic quantities of interest.

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“…Hanniel and Haller [HH11] ray-cast trimmed CAD models in a watertight fashion. Fragments that are in the vicinity of trimming curves are projected onto the surfaces adjacent to these curves.…”

Section: Related Workmentioning

confidence: 99%