diff options
| -rw-r--r-- | src/Runtime/res/effectlib/sampleProbe.glsllib | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/Runtime/res/effectlib/sampleProbe.glsllib b/src/Runtime/res/effectlib/sampleProbe.glsllib index 43024ec3..6556e51c 100644 --- a/src/Runtime/res/effectlib/sampleProbe.glsllib +++ b/src/Runtime/res/effectlib/sampleProbe.glsllib @@ -97,10 +97,16 @@ vec2 getProbeSampleUV( vec3 smpDir, vec4 probeRot, vec2 probeOfs ) vec2 smpUV; #if QT3DS_ENABLE_IBL_FOV - smpUV.x = (2.0 * atan(-smpDir.z, smpDir.x) + 3.14159265358 ) / light_probe_opts.x; - smpUV.y = (2.0 * atan(-smpDir.z, smpDir.y) + 3.14159265358 ) / light_probe_opts.x; + smpUV = vec2(atan(smpDir.x, smpDir.z), asin(smpDir.y)); + // assume equirectangular HDR spherical map (instead of cube map) and warp sample + // UV coordinates accordingly + smpUV *= 2.0 * vec2(0.1591596371160, 0.318319274232054); + // Default FOV is 180 deg = pi rad. Narrow the FOV + // by scaling texture coordinates by the ratio of + // incoming FOV to 180 degrees default + smpUV *= 3.14159265358 / light_probe_opts.x; #else - smpUV.x = atan( smpDir.x, -smpDir.z) / 3.14159265359; + smpUV.x = atan( smpDir.x, smpDir.z) / 3.14159265359; smpUV.y = 1.0 - (acos(smpDir.y) / 1.57079632679); #endif smpUV = transformSample( smpUV.xy * 0.5, probeRot, probeOfs ) + vec2(0.5, 0.5); |