// Gets the normal under the input point in local space based on 2 samples, and assumes localPoint is already on the surface
public Vector3 GetLocalNormalFast2(SgtVector3D localPoint, SgtVector3D right, SgtVector3D forward)
{
var b = GetLocalPoint(localPoint + right);
var c = GetLocalPoint(localPoint + forward);
return((Vector3)SgtVector3D.Cross(localPoint - b, c - localPoint).normalized);
}
private void CalculateHeight(SgtVector3D localPosition, ref float height)
{
localPosition /= localPosition.magnitude;
localPosition *= Density;
var weight = 1.0f;
var total = 0.0f;
for (var i = 0; i < Octaves; i++)
{
total += generators[i].Generate((float)localPosition.x, (float)localPosition.y, (float)localPosition.z) * weight;
weight *= 0.5f;
localPosition *= 2.0;
}
// Scale to -2 .. 2
total *= scale * 2.0f;
// Abs to 0 .. 2
total = System.Math.Abs(total);
if (Invert == true)
{
total = 2.0f - total;
}
// Shift to -1 .. 1
total -= 1.0f;
// Scale to strength and add
height += total * Strength;
}
public void Spawn(SgtTerrain terrain, SgtTerrainLevel level, SgtVector3D localPoint)
{
if (OnSpawn != null)
{
OnSpawn();
}
transform.SetParent(level.transform, false);
// Snap to surface
localPoint = terrain.GetLocalPoint(localPoint);
// Rotate up
var up = Quaternion.Euler(0.0f, Random.Range(0.0f, 360.0f), 0.0f) * Vector3.up;
// Spawn on surface
transform.localPosition = (Vector3)localPoint;
transform.localRotation = Quaternion.FromToRotation(up, terrain.transform.TransformDirection(transform.localPosition));
transform.localScale = Prefab.transform.localScale * Random.Range(ScaleMin, ScaleMax);
//transform.rotation = Quaternion.FromToRotation(up, terrain.transform.TransformDirection(localPosition));
if (AlignToNormal != 0.0f)
{
//var worldRight = transform.right * AlignToNormal;
//var worldForward = transform.forward * AlignToNormal;
//var worldNormal = terrain.GetLocalNormal(localPoint, worldRight, worldForward);
//transform.rotation = Quaternion.FromToRotation(up, worldNormal);
}
}
// Gets the normal under the input point in local space based on 4 samples
public Vector3 GetLocalNormal2(SgtVector3D localPoint, SgtVector3D right, SgtVector3D forward)
{
var a = GetLocalPoint(localPoint - right);
var b = GetLocalPoint(localPoint + right);
var c = GetLocalPoint(localPoint - forward);
var d = GetLocalPoint(localPoint + forward);
return((Vector3)SgtVector3D.Cross(a - b, d - c).normalized);
}
// Gets the surface height under the input point in local space
public float GetLocalHeight(SgtVector3D localPoint)
{
var height = Radius;
if (OnCalculateHeight != null)
{
OnCalculateHeight(localPoint, ref height);
}
return(height);
}
private int CalculateAxis(SgtVector3D vector)
{
vector.x = System.Math.Abs(vector.x);
vector.y = System.Math.Abs(vector.y);
vector.z = System.Math.Abs(vector.z);
if (vector.y > vector.x && vector.y > vector.z)
{
return(1);
}
if (vector.z > vector.x && vector.z > vector.y)
{
return(2);
}
return(0);
}
public static SgtVector3D InvCube(SgtVector3D v)
{
var a = new SgtVector3D(System.Math.Abs(v.x), System.Math.Abs(v.y), System.Math.Abs(v.z));
if (a.x > a.y && a.x > a.z)
{
return(v / a.x);
}
else if (a.y > a.x && a.y > a.z)
{
return(v / a.y);
}
else
{
return(v / a.z);
}
}
private void CalculateHeight(SgtVector3D localPosition, ref float height)
{
localPosition /= localPosition.magnitude;
localPosition *= Density;
var weight = 1.0f;
var total = 0.0f;
for (var i = 0; i < Octaves; i++)
{
total += generators[i].Generate((float)localPosition.x, (float)localPosition.y, (float)localPosition.z) * weight;
weight *= 0.5f;
localPosition *= 2.0;
}
// Scale to -1 .. 1
total *= scale;
// Scale to strength and add
height += total * Strength;
}
private SgtVector3D CalculateTarget()
{
var point = new SgtVector3D(transform.InverseTransformPoint(Target.position));
// Deform by cube shape
if (point.sqrMagnitude > 0.0)
{
var cube = InvCube(point.normalized);
point *= cube.magnitude;
}
// Deform by terrain displacement
var height = GetLocalHeight(point);
if (height > 0.0f)
{
point /= height;
}
return(point);
}
private void CalculateHeight(SgtVector3D localPosition, ref float height)
{
if (Heightmap != null)
{
var uv = SgtHelper.CartesianToPolarUV((Vector3)localPosition);
var color = SampleBilinear(uv);
switch (Encoding)
{
case EncodingType.Alpha:
{
height += Mathf.Lerp(DisplacementMin, DisplacementMax, color.a);
}
break;
case EncodingType.RedGreen:
{
height += Mathf.Lerp(DisplacementMin, DisplacementMax, (color.r * 255.0f + color.g) / 256.0f);
}
break;
}
}
}
public static SgtVector3D Cube(SgtVector3D v)
{
return(v.normalized);
}
// Gets the surface point under the input point in local space
public SgtVector3D GetLocalPoint(SgtVector3D localPoint)
{
return(localPoint.normalized * GetLocalHeight(localPoint));
}
public static SgtVector3D Cross(SgtVector3D a, SgtVector3D b)
{
return(new SgtVector3D(a.y * b.z - a.z * b.y, a.z * b.x - a.x * b.z, a.x * b.y - a.y * b.x));
}
