Dirsig manual

 · This document describes the basics of creating user-defined point sources (sometimes called "secondary sources") in DIRSIG. These point sources can be assigned spectrally varying emission functions and can use angular weighting descriptions to focus or shape the output.  · DIRSIG4 Water Manual DIRSIG Validation Documentation. DIRSIG Validation and Verification Summary Related M.S. and Ph.D. Student Thesis Documents Brian Dobbs, "The Incorporation of Atmospheric Variability into DIRSIG", RIT Imaging Science M.S. thesis Michael.  · Each cell of the base, 12 diamond-shaped cell partition over the sphere is successively split into four sub-cells with each depth level step in the hierarchy. The number of cells for a given partition is equal to 12 ⋅ 4 d, where d is the depth of the partition. Examples of the parition for depths 3, 4, and 5 are shown below.

By default, DIRSIG assumes that the origin of an image (either [0,0] in a UV projection or the insertion point in the tile projection) is at the upper left of the image (the vertical coordinate increases going down). However, many tools use an origin that is at the bottom left of an image (vertical coordinate going up). Peter Arnold, "Modeling and Simulating Chemical Weapon Dispersal Patterns in DIRSIG", RIT Imaging Science M.S. thesis (PDF, MB) Russell White, "Validation of Rochester Institute of Technology’s (RIT’s) Digital Image and Remote Sensing Image Generation (DIRSIG) Model - Reflective Region", RIT Imaging Science M.S. thesis (PDF, MB). Details about using the MPI-enabled version of DIRSIG is described in a supplementary manual. GPU Acceleration Future releases of DIRSIG5 may utilize NVIDIAs CUDA and OptiX frameworks for GPU-accelerated ray tracing, which currently accounts for approximately 60% of the execution time.

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