public Vector3D GetVector(int x, int y)
{
if (UsingNormalMap)
{
var v = new Vector3D(NormalMap.GetPixel(x, y).R - 128, NormalMap.GetPixel(x, y).G - 128, NormalMap.GetPixel(x, y).B);
v = v / v.Length;
return(v);
}
else
{
return(new Vector3D(0, 0, 1));
}
}
public Vector3 GetNormalVector(int x, int y)
{
Vector3 normalVec;
Vector3 disturbanceVector;
if (!UseFixedNormalVector && !UseMouseFollowNormalVector && NormalMap != null)
{
var normalColor = NormalMap.GetPixel(y % NormalMap.Height, x % NormalMap.Width);
normalVec = new Vector3(normalColor.R - 127, normalColor.G - 127, normalColor.B - 127);
normalVec.X /= 127;
normalVec.Y /= 127;
normalVec.Z /= 127;
normalVec = Vector3.Normalize(normalVec);
}
else if (UseMouseFollowNormalVector)
{
var dx = mousePosition.X - x;
var dy = mousePosition.Y - y;
var z = 100 * 100 - dx * dx - dy * dy;
z = z < 0 ? 0 : (float)Math.Sqrt(z);
normalVec = Vector3.Normalize(new Vector3(dx, dy, z));
}
else
{
normalVec = new Vector3(0, 0, 1);
}
if (!UseEmptyDisturbanceVector && HeightMap != null)
{
var hCol = HeightMap.GetPixel(y % HeightMap.Height, x % HeightMap.Width);
var rightHCol = HeightMap.GetPixel(y % HeightMap.Height, (x + 1) % HeightMap.Width);
var downHCol = HeightMap.GetPixel((y + 1) % HeightMap.Height, x % HeightMap.Width);
var dhx = (rightHCol.R - hCol.R + rightHCol.G - hCol.G + rightHCol.B - hCol.B) * Factor;
var dhy = (downHCol.R - hCol.R + downHCol.G - hCol.G + downHCol.B - hCol.B) * Factor;
disturbanceVector = new Vector3(dhx, 0, -normalVec.X + dhx) + new Vector3(dhy, 0, -normalVec.Y * dhy);
}
else
{
disturbanceVector = new Vector3(0, 0, 0);
}
var normalPrim = normalVec + disturbanceVector;
return(Vector3.Normalize(normalPrim));
}
public Vector3 Normal(Vector2 vec)
{
var color = NormalMap.GetPixel((int)(vec.X * NormalMap.Width), (int)(vec.Y * NormalMap.Height));
return(new Vector3(color.R, color.G, color.B));
}