I've been trying to get a HDR skybox in my scene and ran across the following:
- With the option "RGB8" ( osgDB::ReaderWriter::Options( "RGB8" ) ) o The image is converted to LDR before being stored in a texture. Doesn't that defy the whole point of being HDR to begin with? - With the option "RAW" ( osgDB::ReaderWriter::Options( "RAW" ) ) o The image is stored in a texture without with minimal processing. * rawRGBEData divides each component by 255 The problem is that my rendering results are different. RGB8: http://img162.imageshack.us/img162/8467/hdrrgb8rn7.jpg RAW: http://img206.imageshack.us/img206/8574/hdrrawza9.jpg I understand that with "raw" images, the conversion must be done in the shader. Here is my shader: uniform sampler2D diffuseTexture; vec4 textureRGBE( sampler2D sampler, vec2 coords ) { ivec4 rgbe = texture2D( sampler, coords ) * 255. + 0.5; float e = rgbe.a - ( 128.0 + 8.0 ); return vec4( rgbe.rgb * exp2( e ), 1.0 ); } void main(void) { // Sample the texture vec4 diffuse = textureRGBE ( diffuseTexture, gl_TexCoord[0].xy ); vec4 toneMappedColor = vec4( pow( diffuse.rgb, 0.55 ), 1.0 ); gl_FragColor = toneMappedColor; } I would really like to make use of dynamic exposure effects but it seems like I need to maintain HDR values until the moment the color is tone mapped. At least in order to get good results. Please advise, Michael Guerrero ( Delta3D )
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