/// <summary>Gets the current intensity glow intensity, using the glow attenuation factor</summary>
/// <param name="ModelMatrix">The model transformation matrix to apply</param>
/// <param name="Vertices">The verticies to which the glow is to be applied</param>
/// <param name="Face">The face which these vertices make up</param>
/// <param name="GlowAttenuationData">The current glow attenuation</param>
/// <param name="mode">The returned glow attenuation mode</param>
/// <returns></returns>
public static double GetDistanceFactor(Matrix4D ModelMatrix, VertexTemplate[] Vertices, ref MeshFace Face, ushort GlowAttenuationData, out GlowAttenuationMode mode)
{
mode = GlowAttenuationMode.None;
if (Face.Vertices.Length == 0)
{
return(1.0);
}
double halfdistance;
Glow.SplitAttenuationData(GlowAttenuationData, out mode, out halfdistance);
int i = (int)Face.Vertices[0].Index;
Vector3 d = new Vector3(Vertices[i].Coordinates.X, Vertices[i].Coordinates.Y, -Vertices[i].Coordinates.Z);
d.Transform(ModelMatrix);
switch (mode)
{
case GlowAttenuationMode.DivisionExponent2:
{
double t = d.NormSquared();
return(t / (t + halfdistance * halfdistance));
}
case GlowAttenuationMode.DivisionExponent4:
{
double t = d.NormSquared();
t *= t;
halfdistance *= halfdistance;
return(t / (t + halfdistance * halfdistance));
}
default:
return(1.0);
}
}
/// <summary>Gets the current intensity glow intensity, using the glow attenuation factor</summary>
/// <param name="Vertices">The verticies to which the glow is to be applied</param>
/// <param name="Face">The face which these vertices make up</param>
/// <param name="GlowAttenuationData">The current glow attenuation</param>
/// <param name="Camera">The camera position</param>
/// <returns></returns>
public static double GetDistanceFactor(VertexTemplate[] Vertices, ref MeshFace Face, ushort GlowAttenuationData, Vector3 Camera)
{
if (Face.Vertices.Length == 0)
{
return(1.0);
}
GlowAttenuationMode mode;
double halfdistance;
Glow.SplitAttenuationData(GlowAttenuationData, out mode, out halfdistance);
int i = (int)Face.Vertices[0].Index;
double dx = Vertices[i].Coordinates.X - Camera.X;
double dy = Vertices[i].Coordinates.Y - Camera.Y;
double dz = Vertices[i].Coordinates.Z - Camera.Z;
switch (mode)
{
case GlowAttenuationMode.DivisionExponent2:
{
double t = dx * dx + dy * dy + dz * dz;
return(t / (t + halfdistance * halfdistance));
}
case GlowAttenuationMode.DivisionExponent4:
{
double t = dx * dx + dy * dy + dz * dz;
t *= t;
halfdistance *= halfdistance;
return(t / (t + halfdistance * halfdistance));
}
default:
return(1.0);
}
}
