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Face shading: Add shade factor comments

master
paramat 2017-02-06 21:48:54 +00:00
parent 5da3ed19a3
commit 8bc6a303b4
1 changed files with 9 additions and 2 deletions
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11
src/mesh.cpp
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@ -42,8 +42,15 @@ inline static void applyShadeFactor(video::SColor& color, float factor)
void applyFacesShading(video::SColor &color, const v3f &normal) void applyFacesShading(video::SColor &color, const v3f &normal)
{ {
// Many special drawtypes have normals set to 0,0,0 and this /*
// must result in maximum brightness (no face shadng). Some drawtypes have normals set to (0, 0, 0), this must result in
maximum brightness: shade factor 1.0.
Shade factors for aligned cube faces are:
+Y 1.000000 sqrt(1.0)
-Y 0.447213 sqrt(0.2)
+-X 0.670820 sqrt(0.45)
+-Z 0.836660 sqrt(0.7)
*/
float x2 = normal.X * normal.X; float x2 = normal.X * normal.X;
float y2 = normal.Y * normal.Y; float y2 = normal.Y * normal.Y;
float z2 = normal.Z * normal.Z; float z2 = normal.Z * normal.Z;