diff options
Diffstat (limited to 'intern/cycles/kernel/shaders/node_environment_texture.osl')
-rw-r--r-- | intern/cycles/kernel/shaders/node_environment_texture.osl | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/intern/cycles/kernel/shaders/node_environment_texture.osl b/intern/cycles/kernel/shaders/node_environment_texture.osl index bad62e56ab4..4367f7f4994 100644 --- a/intern/cycles/kernel/shaders/node_environment_texture.osl +++ b/intern/cycles/kernel/shaders/node_environment_texture.osl @@ -19,14 +19,52 @@ #include "stdosl.h" #include "node_color.h" +vector environment_texture_direction_to_equirectangular(vector dir) +{ + float u = -atan2(dir[1], dir[0])/(2.0*M_PI) + 0.5; + float v = atan2(dir[2], hypot(dir[0], dir[1]))/M_PI + 0.5; + + return vector(u, v, 0.0); +} + +vector environment_texture_direction_to_mirrorball(vector dir) +{ + dir[1] -= 1.0; + + float div = 2.0*sqrt(max(-0.5*dir[1], 0.0)); + if(div > 0.0) + dir /= div; + + float u = 0.5*(dir[0] + 1.0); + float v = 0.5*(dir[2] + 1.0); + + return vector(u, v, 0.0); +} + shader node_environment_texture( + int use_mapping = 0, + matrix mapping = matrix(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), vector Vector = P, string filename = "", + string projection = "Equirectangular", string color_space = "sRGB", output color Color = color(0.0, 0.0, 0.0), output float Alpha = 1.0) { - Color = (color)environment(filename, Vector, "alpha", Alpha); + vector p = Vector; + + if (use_mapping) + p = transform(mapping, p); + + p = normalize(p); + + if (projection == "Equirectangular") + p = environment_texture_direction_to_equirectangular(p); + else + p = environment_texture_direction_to_mirrorball(p); + + /* todo: use environment for better texture filtering of equirectangular */ + Color = (color)texture(filename, p[0], 1.0 - p[1], "wrap", "periodic", "alpha", Alpha); if (color_space == "sRGB") Color = color_srgb_to_scene_linear(Color); |