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Per polygon material selection via script...done in mesh? About Truespace Archives These pages are a copy of the official truespace forums prior to their removal somewhere around 2011. They are retained here for archive purposes only. Per polygon material selection via script...done in mesh? // Scriptorium 1  |   Order by default Post by ProfessorKhaos // Jan 4, 2007, 9:36am ProfessorKhaos Total Posts: 622 Hi all, Past scripting experience leads me to believe that pointers to the material to be used are defined in the mesh itself on a per polygon basis. I've looked at the cone object and the terrain mesh object and neither uses more than a single material, thus no definitions are called out that I can tell. Does anyone know if/how this can be done in the mesh itself? I think I may be able to turn on/off segments in my LED display by pointing the appropriate polygons to the correct material instead of maintaining a separate material for each segment in the display. Can anyone give me a coding example of material assignments in the mesh? P.K. Post by ProfessorKhaos // Jan 4, 2007, 10:19am ProfessorKhaos Total Posts: 622 Got a reply in the interactive forum and a direction to look but I'm still having a bit of difficulty trying to comprehend how to get at the data code-wise. I'll keep plugging away for a little bit. Maybe I can get it on my own but an actual example might be helpful. Thanks! P.K. Post by tomasb // Jan 4, 2007, 11:19am tomasb Total Posts: 261 Got a reply in the interactive forum and a direction to look but I'm still having a bit of difficulty trying to comprehend how to get at the data code-wise. I'll keep plugging away for a little bit. Maybe I can get it on my own but an actual example might be helpful. Thanks! P.K. example attaches material index stream and sets material for first triangle to index 1 and 0 to other. You can get names other stream by inspecting registred data objects when adding connectors... function OnComputeOutputs(params) { Mesh = params.conValue('inMesh'); // create output mesh from input dwTris = Mesh.GetNumTriangles(); if (!dwTris) return; spMaterialStream = System.CreateDO('Space 3D Package/Material Index Stream Data'); spMaterialStream.SetNumMaterialIndices(dwTris); //initialize to 0 for (i = 0; i<dwTris;i++) { spMaterialStream.index(i) = 0; }; //set material for 1st triangle to 1 spMaterialStream.index(0) = 1; //attach material stream to mesh Mesh.AttachTrianglesStream(spMaterialStream); // put output value params.conValue("Mesh") = Mesh; } Post by ProfessorKhaos // Jan 4, 2007, 11:23am ProfessorKhaos Total Posts: 622 A perfect example!!! Thank you! I can do something with this! Post by tomasb // Jan 4, 2007, 11:34am tomasb Total Posts: 261 one more addition. if the stream is present in the mesh, you can use spMaterialStream = Mesh.GetTrianglesStreamByName('Material Index Stream Data'); directly, so you can perform modifications and not rebuilding. unfortunately in 7.11 there is no way to detect if the stream is present or not; you will get script error when stream not present...

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