/// <summary>
/// Cast a ray (in model space) against a mesh.
/// </summary>
/// <param name="InRay"></param>
/// <param name="vertices"></param>
/// <param name="triangles"></param>
/// <param name="hit"></param>
/// <param name="distance"></param>
/// <param name="cullingMode"></param>
/// <returns></returns>
internal static bool MeshRaycast(Ray InRay, Vector3[] vertices, int[] triangles, out PolyRaycastHit hit, float distance = Mathf.Infinity, Culling cullingMode = Culling.Front)
{
Vector3 hitNormal = Vector3.zero; // vars used in loop
Vector3 vert0, vert1, vert2;
Vector3 origin = InRay.origin, direction = InRay.direction;
hit = new PolyRaycastHit(Mathf.Infinity,
Vector3.zero,
Vector3.zero,
-1);
/**
* Iterate faces, testing for nearest hit to ray origin.
*/
for (int CurTri = 0; CurTri < triangles.Length; CurTri += 3)
{
if (CurTri + 2 >= triangles.Length)
{
continue;
}
if (triangles[CurTri + 2] >= vertices.Length)
{
continue;
}
vert0 = vertices[triangles[CurTri + 0]];
vert1 = vertices[triangles[CurTri + 1]];
vert2 = vertices[triangles[CurTri + 2]];
// Second pass, test intersection with triangle
if (Math.RayIntersectsTriangle2(origin, direction, vert0, vert1, vert2, ref distance, ref hitNormal))
{
if (distance < hit.distance)
{
hit.distance = distance;
hit.triangle = CurTri / 3;
hit.position = InRay.GetPoint(hit.distance);
hit.normal = hitNormal;
}
}
}
hit = new PolyRaycastHit(hit.distance,
InRay.GetPoint(hit.distance),
hitNormal,
hit.triangle);
return(hit.triangle > -1);
}
/// <summary>
/// Calculates the per-vertex weight for each raycast hit and fills in brush target weights.
/// </summary>
/// <param name="target"></param>
/// <param name="settings"></param>
/// <param name="tool"></param>
/// <param name="bMode"></param>
internal static void CalculateWeightedVertices(BrushTarget target, BrushSettings settings, BrushTool tool = BrushTool.None, BrushMode bMode = null)
{
if (target == null || settings == null)
{
return;
}
if (target.editableObject == null)
{
return;
}
bool uniformScale = Math.VectorIsUniform(target.transform.lossyScale);
float scale = uniformScale ? 1f / target.transform.lossyScale.x : 1f;
PolyMesh mesh = target.editableObject.visualMesh;
Transform transform = target.transform;
int vertexCount = mesh.vertexCount;
Vector3[] vertices = mesh.vertices;
if (!uniformScale)
{
// As we only increase size only when it's needed, always make sure to
// use the vertexCount variable in loop statements and not the buffer length.
if (s_WorldBuffer.Length < vertexCount)
{
System.Array.Resize <Vector3>(ref s_WorldBuffer, vertexCount);
}
for (int i = 0; i < vertexCount; i++)
{
s_WorldBuffer[i] = transform.TransformPoint(vertices[i]);
}
vertices = s_WorldBuffer;
}
AnimationCurve curve = settings.falloffCurve;
float radius = settings.radius * scale, falloff_mag = Mathf.Max((radius - radius * settings.falloff), 0.00001f);
Vector3 hitPosition = Vector3.zero;
PolyRaycastHit hit;
if (tool == BrushTool.Texture && mesh.subMeshCount > 1)
{
var mode = bMode as BrushModeTexture;
int[] submeshIndices = mesh.subMeshes[mode.m_CurrentMeshACIndex].indexes;
for (int n = 0; n < target.raycastHits.Count; n++)
{
hit = target.raycastHits[n];
hit.SetVertexCount(vertexCount);
for (int i = 0; i < vertexCount; i++)
{
hit.weights[i] = 0f;
}
hitPosition = uniformScale ? hit.position : transform.TransformPoint(hit.position);
for (int i = 0; i < submeshIndices.Length; i++)
{
int currentIndex = submeshIndices[i];
float dist = (hitPosition - vertices[currentIndex]).magnitude;
float delta = radius - dist;
if (delta >= 0)
{
float weight = Mathf.Clamp(curve.Evaluate(1f - Mathf.Clamp(delta / falloff_mag, 0f, 1f)), 0f, 1f);
hit.weights[currentIndex] = weight;
}
}
}
}
else
{
int[][] common = PolyMeshUtility.GetCommonVertices(mesh);
Vector3 buf = Vector3.zero;
for (int n = 0; n < target.raycastHits.Count; n++)
{
hit = target.raycastHits[n];
hit.SetVertexCount(vertexCount);
hitPosition = uniformScale ? hit.position : transform.TransformPoint(hit.position);
for (int i = 0; i < common.Length; i++)
{
int[] commonItem = common[i];
int commonArrayCount = commonItem.Length;
Math.Subtract(vertices[commonItem[0]], hitPosition, ref buf);
float sqrDist = buf.sqrMagnitude;
if (sqrDist > radius * radius)
{
for (int j = 0; j < commonArrayCount; j++)
{
hit.weights[commonItem[j]] = 0f;
}
}
else
{
float weight = Mathf.Clamp(curve.Evaluate(1f - Mathf.Clamp((radius - Mathf.Sqrt(sqrDist)) / falloff_mag, 0f, 1f)), 0f, 1f);
for (int j = 0; j < commonArrayCount; j++)
{
hit.weights[commonItem[j]] = weight;
}
}
}
}
}
target.GetAllWeights(true);
}