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Adaptive Sampling of Intersectable Models Exploiting Image and Object-space Coherence

Adamson, Anders ; Alexa, Marc ; Nealen, Andrew (2005)
Adaptive Sampling of Intersectable Models Exploiting Image and Object-space Coherence.
Proceedings of the 2005 ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games (I3D).
Conference or Workshop Item, Bibliographie

Abstract

We present a sampling strategy and rendering framework for intersectable models, whose surface is implicitly defined by a black box intersection test that provides the location and normal of the closest intersection of a ray with the surface. To speed up image generation despite potentially slow intersection tests, our method exploits spatial coherence by adjusting the sampling resolution in image space to the surface variation in object space. The result is a set of small, view-dependent bilinear surface approximations, which are rendered as quads using conventional graphics hardware. The advantage of this temporary rendering representation is two-fold: First, rendering is performed on the GPU, leaving CPU time for ray intersection computation. As the number of primitives is typically small, complex per vertex or per fragment programs can be used to achieve a variety of rendering effects. Second, bilinear surface approximations are derived from the geometry and can be reused in other views. Here, graphics hardware is exploited to determine the subset of image space in need of re-sampling. We demonstrate our system by ray casting an implicit surface defined from point samples, for which current ray-surface intersection computations are usually too slow to generate images at interactive rates.

Item Type: Conference or Workshop Item
Erschienen: 2005
Creators: Adamson, Anders ; Alexa, Marc ; Nealen, Andrew
Type of entry: Bibliographie
Title: Adaptive Sampling of Intersectable Models Exploiting Image and Object-space Coherence
Language: English
Date: 2005
Publisher: ACM Press, New York
Event Title: Proceedings of the 2005 ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games (I3D)
Abstract:

We present a sampling strategy and rendering framework for intersectable models, whose surface is implicitly defined by a black box intersection test that provides the location and normal of the closest intersection of a ray with the surface. To speed up image generation despite potentially slow intersection tests, our method exploits spatial coherence by adjusting the sampling resolution in image space to the surface variation in object space. The result is a set of small, view-dependent bilinear surface approximations, which are rendered as quads using conventional graphics hardware. The advantage of this temporary rendering representation is two-fold: First, rendering is performed on the GPU, leaving CPU time for ray intersection computation. As the number of primitives is typically small, complex per vertex or per fragment programs can be used to achieve a variety of rendering effects. Second, bilinear surface approximations are derived from the geometry and can be reused in other views. Here, graphics hardware is exploited to determine the subset of image space in need of re-sampling. We demonstrate our system by ray casting an implicit surface defined from point samples, for which current ray-surface intersection computations are usually too slow to generate images at interactive rates.

Uncontrolled Keywords: Intersection algorithms, Surface modeling, Point sample rendering
Divisions: 20 Department of Computer Science
20 Department of Computer Science > Interactive Graphics Systems
Date Deposited: 16 Apr 2018 09:04
Last Modified: 16 Apr 2018 09:04
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