diff options
Diffstat (limited to 'intern/cycles/kernel/camera/projection.h')
| -rw-r--r-- | intern/cycles/kernel/camera/projection.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/intern/cycles/kernel/camera/projection.h b/intern/cycles/kernel/camera/projection.h index c9fe3a6c7fb..1d16aa35abe 100644 --- a/intern/cycles/kernel/camera/projection.h +++ b/intern/cycles/kernel/camera/projection.h @@ -201,11 +201,35 @@ ccl_device float2 direction_to_mirrorball(float3 dir) return make_float2(u, v); } +/* Single face of a equiangular cube map projection as described in + https://blog.google/products/google-ar-vr/bringing-pixels-front-and-center-vr-video/ */ +ccl_device float3 equiangular_cubemap_face_to_direction(float u, float v) +{ + u = (1.0f - u); + + u = tanf(u * M_PI_2_F - M_PI_4_F); + v = tanf(v * M_PI_2_F - M_PI_4_F); + + return make_float3(1.0f, u, v); +} + +ccl_device float2 direction_to_equiangular_cubemap_face(float3 dir) +{ + float u = atan2f(dir.y, dir.x) * 2.0f / M_PI_F + 0.5f; + float v = atan2f(dir.z, dir.x) * 2.0f / M_PI_F + 0.5f; + + u = 1.0f - u; + + return make_float2(u, v); +} + ccl_device_inline float3 panorama_to_direction(ccl_constant KernelCamera *cam, float u, float v) { switch (cam->panorama_type) { case PANORAMA_EQUIRECTANGULAR: return equirectangular_range_to_direction(u, v, cam->equirectangular_range); + case PANORAMA_EQUIANGULAR_CUBEMAP_FACE: + return equiangular_cubemap_face_to_direction(u, v); case PANORAMA_MIRRORBALL: return mirrorball_to_direction(u, v); case PANORAMA_FISHEYE_EQUIDISTANT: @@ -230,6 +254,8 @@ ccl_device_inline float2 direction_to_panorama(ccl_constant KernelCamera *cam, f switch (cam->panorama_type) { case PANORAMA_EQUIRECTANGULAR: return direction_to_equirectangular_range(dir, cam->equirectangular_range); + case PANORAMA_EQUIANGULAR_CUBEMAP_FACE: + return direction_to_equiangular_cubemap_face(dir); case PANORAMA_MIRRORBALL: return direction_to_mirrorball(dir); case PANORAMA_FISHEYE_EQUIDISTANT: |