Normal Map with Alpha
Blitz3D Forums/Blitz3D Programming/Normal Map with Alpha
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Anybody has seen or some ideas on how to reproduce this kind of normal map?  It's an object space normal map but I don't know how it generated the alpha. DDS format |
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| I don't know much about the DDS format, but given there are a number of "types" of DDS file and that B3D only supports some of these, I imagine that bit-depth or a header flag is involved somewhere. Whether due to a mask colour defined in the header, or an instruction to use up to 8bits or so for alpha levels (i.e. as 32-bit). If the former, then any 0,0,0 value might be considered transparent if the latter, then possibly a gradient of transparency is encoded within a 4th byte. That's just a guess based on the typical methods for encoding transparency in other formats. |
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| Thanks PJ, actually I kind of posted in the wrong category but anyway I'm trying to use this under blitz irrlicht wrapper which supports normal mapping. I'm still curious what software tools can generate this type of 32bit with alpha data. |
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| tga has an alpha channel. png too. But must be saved correctly. see also codearchive. you may habe to combine several layers of textures. dds is good when it comes to masked textures. Normalmap can be anything, bmp, jpg... tho I never combined normal and alpha in blitz, so I don't know if they like eachother. the photoshop dds export plugin allows you to play with the options, and most likely also the one of blender. |
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