Vector3 CalculateSurfaceNormal(Vector3 p)
{
float H = 0.001f;
float dx = DensityFunctions.Density_Func(p + new Vector3(H, 0.0f, 0.0f)) - DensityFunctions.Density_Func(p - new Vector3(H, 0.0f, 0.0f));
float dy = DensityFunctions.Density_Func(p + new Vector3(0.0f, H, 0.0f)) - DensityFunctions.Density_Func(p - new Vector3(0.0f, H, 0.0f));
float dz = DensityFunctions.Density_Func(p + new Vector3(0.0f, 0.0f, H)) - DensityFunctions.Density_Func(p - new Vector3(0.0f, 0.0f, H));
return(Vector3.Normalize(new Vector3(dx, dy, dz)));
}
Vector3 ApproximateZeroCrossingPosition(Vector3 p0, Vector3 p1)
{
// approximate the zero crossing by finding the min value along the edge
float minValue = 100000.0f;
float t = 0.0f;
float currentT = 0.0f;
int steps = 8;
float increment = 1.0f / (float)steps;
while (currentT <= 1.0f)
{
Vector3 p = p0 + ((p1 - p0) * currentT);
float density = Mathf.Abs(DensityFunctions.Density_Func(p));
if (density < minValue)
{
minValue = density;
t = currentT;
}
currentT += increment;
}
return(p0 + ((p1 - p0) * t));
}
public override void OnGUI(MaterialEditor materialEditor,
MaterialProperty[] properties)
{
Material targetMat = materialEditor.target as Material;
EditorGUI.BeginChangeCheck();
// option resets every time the spector isn't being renderer
if (targetMat.IsKeywordEnabled("FIXED"))
{
_option = DensityFunctions.Fixed;
}
else if (targetMat.IsKeywordEnabled("LIN"))
{
_option = DensityFunctions.Linear;
}
else if (targetMat.IsKeywordEnabled("POW2"))
{
_option = DensityFunctions.Pow2;
}
else if (targetMat.IsKeywordEnabled("POW3"))
{
_option = DensityFunctions.Pow3;
}
else if (targetMat.IsKeywordEnabled("SINE"))
{
_option = DensityFunctions.Sine;
}
_option = (DensityFunctions)EditorGUILayout.EnumPopup("Density Function",
_option);
if (EditorGUI.EndChangeCheck())
{
targetMat.DisableKeyword("FIXED");
targetMat.DisableKeyword("LIN");
targetMat.DisableKeyword("POW2");
targetMat.DisableKeyword("POW3");
targetMat.DisableKeyword("SINE");
// enable or disable the keyword based on enum
switch (_option)
{
case DensityFunctions.Fixed:
targetMat.EnableKeyword("FIXED");
break;
case DensityFunctions.Linear:
targetMat.EnableKeyword("LIN");
break;
case DensityFunctions.Pow2:
targetMat.EnableKeyword("POW2");
break;
case DensityFunctions.Pow3:
targetMat.EnableKeyword("POW3");
break;
case DensityFunctions.Sine:
targetMat.EnableKeyword("SINE");
break;
}
}
base.OnGUI(materialEditor, properties);
}
