. Left: 2D (joint) histogram and three fiber surface control polygons (FSCPs), specified by red, blue and green annotations. Right: Corresponding fiber surfaces. Let us compare residence time and oxygen across both data range and spatial domain, in a simulation of coal combustion in GE-Alstom's 15 MW th Boiler Simulation Facility (BSF). These surfaces let us show low and high regions of oxygen as they occur over the entire course of the simulation, classified by annotating the 2D scatterplot (joint histogram) with FSCPs. Direct ray casting allows users to explore and manipulate fiber surfaces interactively on larger datasets; in this case at 16 fps at 1024×1024 on an NVIDIA Geforce GT 650M mobile GPU. Abstract-Multifield data are common in visualization. However, reducing these data to comprehensible geometry is a challenging problem. Fiber surfaces, an analogy of isosurfaces to bivariate volume data, are a promising new mechanism for understanding multifield volumes. In this work, we explore direct ray casting of fiber surfaces from volume data without any explicit geometry extraction. We sample directly along rays in domain space, and perform geometric tests in range space where fibers are defined, using a signed distance field derived from the control polygons. Our method requires little preprocess, and enables real-time exploration of data, dynamic modification and pixel-exact rendering of fiber surfaces, and support for higher-order interpolation in domain space. We demonstrate this approach on several bivariate datasets, including analysis of multi-field combustion data.
Wu et al. REF offer a method for direct volume rendering of fiber surfaces which provides per-pixel accurate rendering of fiber surface geometries while supporting the use of higher-order interpolation schemes.
Direct Multifield Volume Ray Casting of Fiber Surfaces
IEEE Transactions on Visualization and Computer Graphics
IEEE Transactions on Visualization and Computer Graphics
Medicine Computer Science