public static bool MeshesOverlap(JMesh meshA, JMesh meshB)
{
if (!AABBOverlap(meshA.AABB, meshB.AABB))
{
return(false);
}
var aVertices = meshA.EdgeVertices;
var aLength = meshA.EdgeVertices.Length - 1;
var bVertices = meshB.EdgeVertices;
var bLength = meshB.EdgeVertices.Length - 1;
// Check for any edges crossing
for (var i = 0; i < aLength; i++)
{
var aStart = aVertices[i];
var aEnd = aVertices[i + 1];
for (var j = 0; j < bLength; j++)
{
var bStart = bVertices[j];
var bEnd = bVertices[j + 1];
//Debug.Log("i: " + i + ", j: " + j + ", aStart: " + aStart + ", aEnd: " + aEnd + ", bStart: " + bStart + ", bEnd: " + bEnd);
if (LinesCross(aStart, aEnd, bStart, bEnd))
{
return(true);
}
}
}
//Debug.Log("No lines crossed, looking for points inside each mesh");
// Check if any vertices from meshA is inside meshB
for (var i = 0; i < aLength; i++)
{
var pointA = aVertices[i];
if (IsPointInsideMesh(pointA, meshB))
{
return(true);
}
}
//Debug.Log("No points from meshA inside meshB");
for (var i = 0; i < bLength; i++)
{
var pointB = bVertices[i];
if (IsPointInsideMesh(pointB, meshA))
{
return(true);
}
}
//Debug.Log("No points from meshB inside meshA");
//Debug.Log("No mesh overlap");
return(false);
}
public static JMesh FromMeshAndTransform(JMesh meshIdentity, Matrix4x4 transformMatrix)
{
var vertices = meshIdentity.EdgeVertices;
var verticesLength = vertices.Length;
var transformedVertices = new Vector3[verticesLength];
for (var i = 0; i < verticesLength; i++)
{
var transformedVertex = transformMatrix.MultiplyPoint3x4(vertices[i]);
transformedVertices[i] = transformedVertex;
}
var transformedNormals = CalculateOutwardNormals(transformedVertices);
return(new JMesh(transformedVertices, transformedNormals));
}
private void Awake()
{
JColliderContainer.INSTANCE.Add(this);
IdGenerated = JColliderContainer.INSTANCE.NextId();
if (meshFilter == null)
{
meshFilter = GetComponent <MeshFilter>();
if (meshFilter == null)
{
throw new System.Exception("JCollider needs a reference to a mesh filter");
}
}
meshIdentity = JMesh.CalculateJMesh(meshFilter.mesh.vertices, meshFilter.mesh.triangles);
meshFrame = meshIdentity;
}
void LateUpdate()
{
pushPairs.Clear();
collisionMapQueue.Clear();
var allActiveJColliders = JColliderContainer.INSTANCE.ActiveColliders();
var lengthAllActiveJColliders = allActiveJColliders.Count;
if (lengthAllActiveJColliders == 0)
{
return;
}
// Update bounds, vertices and normals for each collider based on their transform
for (int i = 0; i < lengthAllActiveJColliders; i++)
{
var collider = allActiveJColliders[i];
collider.meshFrame = JMesh.FromMeshAndTransform(collider.meshIdentity, collider.meshFilter.transform.localToWorldMatrix);
}
var completedCollisionsThisFrame = new HashSet <JCollisionPair>();
var collisionMap = CollisionMap.GenerateMapFor(allActiveJColliders, 4, CameraHelper.GetCameraWorldCoordinateBounds());
collisionMapQueue.Add(collisionMap);
while (collisionMapQueue.HasNext())
{
var currentCollisionMap = collisionMapQueue.Next();
if (currentCollisionMap.bodies != null)
{
DoCollisionChecks(currentCollisionMap.bodies, completedCollisionsThisFrame);
}
else
{
collisionMapQueue.Add(currentCollisionMap.subMaps);
}
}
enterStayExitManager.CompleteFrame();
}
public static bool IsPointInsideMesh(Vector3 point, JMesh meshTransformed)
{
// Assumes that the point is withing the AABB
var edgesCrossed = 0;
var vertices = meshTransformed.EdgeVertices;
var end = vertices.Length - 1;
var horizontalPointSlope = Slope.FromPoints(point, new Vector3(point.x - 1, 0, point.z));
var endOfRayCast = new Vector3(meshTransformed.AABB.min.x - 1f, 0, point.z);
for (var i = 0; i < end; i++)
{
var pointA = vertices[i];
var pointB = vertices[i + 1];
/**
* Quick check to see if the point is exactly on a vertex.
* If it is, the point counts as being inside the mesh.
**/
if (pointA.x == point.x && pointA.z == point.z)
{
//Debug.Log("Point is exactly on an existing point, should return true");
return(true);
}
var edgeSlope = Slope.FromPoints(pointA, pointB);
if (edgeSlope.IsPointOnLineInXZPlane(point, POINT_MAX_DIFF))
{
//Debug.Log("Point is on line in XZ plane, edge: " + (pointB - pointA));
return(true);
}
var intersection = edgeSlope.CalculateIntersection(horizontalPointSlope);
if (LinesCross(point, endOfRayCast, pointA, pointB))
{
//Debug.Log("Crossed edge! " + (pointB - pointA));
edgesCrossed++;
}
//if ((pointA.z <= point.z && point.z <= pointB.z) || (pointB.z <= point.z && point.z <= pointA.z))
//{
// // Can cross vertically
// if (pointA.x <= point.x || pointB.x <= point.x)
// {
// /** The edge starts or ends to the left of our point,
// * meaning we cross the edge with our horizontal leftwards raycast
// */
// /**
// * Check if point is on an edge. This must be done before the next type of check
// * that checks for a single point being added twice to edgesCrossed.
// **/
// var slope = Slope.FromPoints(pointA, pointB);
// if (slope.IsPointOnLineInXZPlane(point, POINT_MAX_DIFF))
// {
// return true;
// }
// /**
// * Need to perform an additional check so that we don't include points crossed twice.
// * If our point is on the exact same "axis" (x or z position) as our end-point, don't
// * count it again since its been crossed when it was on pointA.
// * We only count point-crossing for pointA to avoid double-counting.
// */
// if (pointB.x == point.x && pointB.z == point.z)
// {
// continue;
// }
// var xIntersection = slope.CalculateIntersectionWithHorizontalLine(point.z);
// var minX = Mathf.Min(pointA.x, pointB.x);
// if (minX <= xIntersection && xIntersection <= point.x)
// {
// edgesCrossed++;
// }
// }
//}
}
return(edgesCrossed % 2 != 0);
}
