The image demonstrates the output of a shell script that uses BRL-CAD tools to procedurally create and render the SGI Cube. Scripting InterfaceīRL-CAD can run series of commands piped in or redirected to it via standard input, and it is considerably more efficient to batch multiple BRL-CAD commands together via standard input instead of re-invoking BRL-CAD for each command. The model is entirely composed of implicit primitives combined together with CSG boolean operations. This raytrace image is a multiple-view hidden line rendering of an Mi28 Havoc Russian attack helicopter using BRL-CAD's rtedge utility. The model is entirely constructed from implicit primitives and CSG boolean operations. This image, provided courtesy of GSI Solutions, Inc., depicts a detailed M1A1 tank on a pedestal in a mirrored showcase room. While now a fully hybrid modeling system, BRL-CAD has its roots in CSG modeling with implicit primitives. A full light simulation was computed to generate the image with all exterior and interior vehicle detail, including every nut, bolt, wire, and component inside the vehicle and every leaf and blade of grass modeled as actual geometry (with no textures and no procedural geometry). Representing more than 8 trillion rays fired at this 11-million-polygon scene (amounting to more than 20 million rays per second on 2004 hardware), this figure signifies the path tracing capability of BRL-CAD. The image shown is the classic computer graphics Utah teapot model prepared for 3D printing and rendered via BRL-CAD ray tracing. BRL-CAD is one of the few 3D solid modeling systems that not only support geometry in boundary representation NURBS format but also provide extensive support for robust solid ray tracing of NURBS geometry. Boundary Representationīoundary representation NURBS surface geometry is one of the dominant geometric representation formats in CAD. This screenshot shows a classic "Sphere Flake" model with five levels of recursion, specular reflections, multiple light sources, environment mapping, checkered texture synthesis, ambient occlusion, and soft shadows. Procedural GeometryīRL-CAD provides a comprehensive procedural geometry interface as a means for creating models algorithmically instead of manually. This screenshot shows a model imported from the Rhino3D 3DM file format into BRL-CAD as NURBS boundary representation geometry, visualized via OpenGL. Geometry ConversionĪs shown, a BRL-CAD target description can be converted to a finite element mesh (FEM) using the BRL-CAD g-sat exporter and Cubit from Sandia National Laboratories. The bearing is modeled with a material appearance resembling acrylic glass, and this raytracing result shows reflection, refraction, shadowing, and some caustic effects. The image shown is a BRL-CAD 2D framebuffer screenshot displaying the rendering of a ball bearing. Raytracing is central to BRL-CAD as a means for performing geometric analysis (e.g., calculating weights and moments of inertia) and for rendering images for visualization purposes. This model was created by students new to BRL-CAD in the span of about 2 weeks, starting from actual measurements in a museum. Shown is a 3D model of a Goliath tracked mine, a German-engineered remote controlled vehicle used during World War II. Solid modeling is distinguished from other forms of geometric modeling by an emphasis on being physically accurate, fully describing 3D space. Solid GeometryīRL-CAD focuses on solid modeling CAD. Let's take a quick look at just some of the high-level features provided by BRL-CAD. One strength of a solid modeling system with integrated high-performance rendering is the ability to showcase some of those features graphically. BRL-CAD has thousands of distinct features that have been developed over a number of decades.
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