public void rebuildLightmap()
{
Console.WriteLine(">> Rebuilding Light Map ... [" + lights + " light sources]");
Vector l;
float fnx, fny, angle, phongfact, sheen, spread;
uint diffuse, specular, cos, dr, dg, db, sr, sg, sb;
for (var ny = -128; ny < 128; ny++)
{
fny = (float)ny * divBy128;
for (var nx = -128; nx < 128; nx++)
{
pos = nx + 128 + ((ny + 128) << 8);
fnx = nx * divBy128;
sr = sg = sb = 0;
dr = ColorUtility.getRed(ambient);
dg = ColorUtility.getGreen(ambient);
db = ColorUtility.getBlue(ambient);
for (var i = 0; i < lights; i++)
{
l = light[i].v;
diffuse = light[i].diffuse;
specular = light[i].specular;
sheen = light[i].highlightSheen * divBy255;
spread = (float)light[i].highlightSpread * divBy4096;
spread = (spread < 0.01f)?0.01f:spread;
cos = (uint)(255 * Vector.Angle(light[i].v, new Vector(fnx, fny, sphere[pos])));
cos = (cos > 0)?cos:0;
dr += (ColorUtility.getRed(diffuse) * cos) >> 8;
dg += (ColorUtility.getGreen(diffuse) * cos) >> 8;
db += (ColorUtility.getBlue(diffuse) * cos) >> 8;
phongfact = sheen * (float)Math.Pow(cos * divBy255, 1 / spread);
sr += (uint)(ColorUtility.getRed(specular) * phongfact);
sg += (uint)(ColorUtility.getGreen(specular) * phongfact);
sb += (uint)(ColorUtility.getBlue(specular) * phongfact);
}
this.diffuse[pos] = ColorUtility.getCropColor(dr, dg, db);
this.specular[pos] = ColorUtility.getCropColor(sr, sg, sb);
}
}
}
/// <summary>
/// Backface culling and frustrum clipping.
/// </summary>
/// <param name="w"></param>
/// <param name="h"></param>
public void ClipFrustrum(int w, int h)
{
if (getParent().material == null)
{
visible = false; return;
}
outOfFrustrum = (p1.clipcode & p2.clipcode & p3.clipcode) != 0;
if (outOfFrustrum)
{
visible = false; return;
}
if (n2.Z > 0.5)
{
visible = true; return;
}
triangleCenter.X = (p1.pos2.X + p2.pos2.X + p3.pos2.X);
triangleCenter.Y = (p1.pos2.Y + p2.pos2.Y + p3.pos2.Y);
triangleCenter.Z = (p1.pos2.Z + p2.pos2.Z + p3.pos2.Z);
visible = Vector.Angle(triangleCenter, n2) > 0;
}
