void CreateDecalForStaticObject(ShapeTriangleID startTriangle, Vec3 pos, Vec3 normal,
MapObject parentMapObject)
{
Shape currentShape = null;
Mat4 shapeTransform = Mat4.Zero;
Vec3[] shapeVertices = null;
int[] shapeIndices = null;
bool existsNormalsMore45Degrees = false;
//find near triangles
//Set<ShapeTriangleID> triangleIDs = new Set<ShapeTriangleID>();
{
Sphere checkSphere = new Sphere(pos, Type.Size * .5f * 1.41f); //Sqrt(2)
//Set<ShapeTriangleID> checkedTriangles = new Set<ShapeTriangleID>();
//Stack<ShapeTriangleID> trianglesForCheck = new Stack<ShapeTriangleID>( 16 );
trianglesForCheck.Push(startTriangle);
while (trianglesForCheck.Count != 0)
{
ShapeTriangleID triangle = trianglesForCheck.Pop();
//add to checked triangles
if (!checkedTriangles.AddWithCheckAlreadyContained(triangle))
{
//ignore already checked triangles
continue;
}
//get triangle points
Vec3 p0, p1, p2;
{
if (currentShape != triangle.shape)
{
currentShape = triangle.shape;
if (currentShape.ShapeType == Shape.Type.Mesh)
{
((MeshShape)currentShape).GetData(out shapeVertices, out shapeIndices);
}
else if (currentShape.ShapeType == Shape.Type.HeightField)
{
((HeightFieldShape)currentShape).GetVerticesAndIndices(true,
out shapeVertices, out shapeIndices);
}
else
{
Log.Fatal("DecalCreator: Not supported shape type ({0}).",
currentShape.ShapeType.ToString());
}
shapeTransform = currentShape.Body.GetTransform();
if (!currentShape.IsIdentityTransform)
{
shapeTransform *= currentShape.GetTransform();
}
}
int index = triangle.triangleID * 3;
p0 = shapeTransform * shapeVertices[shapeIndices[index + 0]];
p1 = shapeTransform * shapeVertices[shapeIndices[index + 1]];
p2 = shapeTransform * shapeVertices[shapeIndices[index + 2]];
}
//cull by checkBounds
if (!checkSphere.TriangleIntersection(p0, p1, p2))
{
continue;
}
//check normal
bool correctNormal = false;
if (Type.SpreadType != DecalCreatorType.SpreadTypes.Directional)
{
Plane plane = Plane.FromPoints(p0, p1, p2);
if (plane.GetSide(pos + normal) == Plane.Side.Positive)
{
Radian angle = MathFunctions.ACos(Vec3.Dot(normal, plane.Normal));
if (angle <= new Degree(70.0f).InRadians())
{
if (!existsNormalsMore45Degrees && angle >= new Degree(45.0f).InRadians())
{
existsNormalsMore45Degrees = true;
}
correctNormal = true;
}
}
}
else
{
correctNormal = true;
}
if (correctNormal)
{
//add triangle to result list
triangleIDs.Add(triangle);
}
//add near triangles to check list
{
//expand vertices
const float border = .001f;
Vec3 center = (p0 + p1 + p2) * (1.0f / 3.0f);
Vec3 diff0 = p0 - center;
Vec3 diff1 = p1 - center;
Vec3 diff2 = p2 - center;
if (diff0 != Vec3.Zero && diff1 != Vec3.Zero && diff2 != Vec3.Zero)
{
p0 += diff0.GetNormalize() * border;
p1 += diff1.GetNormalize() * border;
p2 += diff2.GetNormalize() * border;
Vec3 p01 = (p0 + p1) * .5f;
Vec3 p12 = (p1 + p2) * .5f;
Vec3 p20 = (p2 + p0) * .5f;
//find triangles
for (int n = 0; n < 3; n++)
{
Vec3 p = Vec3.Zero;
switch (n)
{
case 0: p = p01; break;
case 1: p = p12; break;
case 2: p = p20; break;
}
RayCastResult[] piercingResult =
PhysicsWorld.Instance.RayCastPiercing(new Ray(
p + normal * .025f, -normal * .05f), (int)ContactGroup.CastOnlyCollision);
foreach (RayCastResult result in piercingResult)
{
if (result.Shape != null)
{
trianglesForCheck.Push(new ShapeTriangleID(
result.Shape, result.TriangleID));
}
}
}
}
}
}
checkedTriangles.Clear();
}
if (triangleIDs.Count == 0)
{
return;
}
//calculate perpendiculars to normal
Vec3 side1Normal;
Vec3 side2Normal;
{
if (Math.Abs(normal.X) > .001f || Math.Abs(normal.Y) > .001f)
{
side1Normal = Mat3.FromRotateByZ(MathFunctions.PI / 2) *
new Vec3(normal.X, normal.Y, 0);
side1Normal.Normalize();
}
else
{
side1Normal = new Vec3(1, 0, 0);
}
side2Normal = Vec3.Cross(normal, side1Normal);
}
//generate clip planes
Plane[] clipPlanes = new Plane[6];
{
float halfSize = Type.Size * .5f;
if (existsNormalsMore45Degrees)
{
halfSize *= 1.41f;
}
Plane p;
p = Plane.FromVectors(normal, -side2Normal, Position);
clipPlanes[0] = new Plane(p.Normal, p.Distance + halfSize);
p = Plane.FromVectors(normal, side2Normal, Position);
clipPlanes[1] = new Plane(p.Normal, p.Distance + halfSize);
p = Plane.FromVectors(normal, -side1Normal, Position);
clipPlanes[2] = new Plane(p.Normal, p.Distance + halfSize);
p = Plane.FromVectors(normal, side1Normal, Position);
clipPlanes[3] = new Plane(p.Normal, p.Distance + halfSize);
p = Plane.FromVectors(side1Normal, side2Normal, Position);
clipPlanes[4] = new Plane(p.Normal, p.Distance + halfSize);
//clipPlanes[ 4 ] = new Plane( p.Normal, p.Distance + halfSize * .5f );
p = Plane.FromVectors(side1Normal, -side2Normal, Position);
clipPlanes[5] = new Plane(p.Normal, p.Distance + halfSize);
//clipPlanes[ 5 ] = new Plane( p.Normal, p.Distance + halfSize * .5f );
}
//generate vertices and indices by triangles
//List<Decal.Vertex> vertices = new List<Decal.Vertex>( triangleIDs.Count * 3 );
//List<int> indices = new List<int>( triangleIDs.Count * 3 );
List <Decal.Vertex> vertices = tempVertices;
List <int> indices = tempIndices;
vertices.Clear();
indices.Clear();
{
foreach (ShapeTriangleID triangle in triangleIDs)
{
Vec3 p0, p1, p2;
{
if (currentShape != triangle.shape)
{
currentShape = triangle.shape;
if (currentShape.ShapeType == Shape.Type.Mesh)
{
((MeshShape)currentShape).GetData(out shapeVertices, out shapeIndices);
}
else if (currentShape.ShapeType == Shape.Type.HeightField)
{
((HeightFieldShape)currentShape).GetVerticesAndIndices(true,
out shapeVertices, out shapeIndices);
}
else
{
Log.Fatal("DecalCreator: Not supported shape type ({0}).",
currentShape.ShapeType.ToString());
}
shapeTransform = currentShape.Body.GetTransform();
if (!currentShape.IsIdentityTransform)
{
shapeTransform *= currentShape.GetTransform();
}
}
int index = triangle.triangleID * 3;
p0 = shapeTransform * shapeVertices[shapeIndices[index + 0]];
p1 = shapeTransform * shapeVertices[shapeIndices[index + 1]];
p2 = shapeTransform * shapeVertices[shapeIndices[index + 2]];
}
List <Vec3> list = new List <Vec3>();
list.Add(p0);
list.Add(p1);
list.Add(p2);
//clip by planes
foreach (Plane plane in clipPlanes)
{
list = CutConvexPlanePolygonByPlane(list, plane);
if (list == null)
{
break;
}
}
//add to vertices and indices lists
if (list != null)
{
int vertexCount = vertices.Count;
Vec3 norm = Plane.FromPoints(p0, p1, p2).Normal;
foreach (Vec3 p in list)
{
vertices.Add(new Decal.Vertex(p, norm, Vec2.Zero, Vec3.Zero));
}
for (int n = 1; n < list.Count - 1; n++)
{
indices.Add(vertexCount);
indices.Add(vertexCount + n);
indices.Add(vertexCount + n + 1);
}
}
}
}
triangleIDs.Clear();
if (indices.Count == 0)
{
return;
}
//calculate texCoord and Type.DepthRenderOffset
{
Plane planeSide1 = Plane.FromVectors(normal, side1Normal, Position);
Plane planeSide2 = Plane.FromVectors(normal, side2Normal, Position);
float invSize = 1.0f / Type.Size;
for (int n = 0; n < vertices.Count; n++)
{
Decal.Vertex vertex = vertices[n];
//calculate texCoord
float distance1 = planeSide1.GetDistance(vertex.position);
float distance2 = planeSide2.GetDistance(vertex.position);
vertex.texCoord = new Vec2(distance1 * invSize + .5f, distance2 * invSize + .5f);
//add Type.DepthRenderOffset
vertex.position = vertex.position + normal * Type.DepthRenderOffset;
vertices[n] = vertex;
}
}
//calculate tangent vectors
{
int triangleCount = indices.Count / 3;
for (int nTriangle = 0; nTriangle < triangleCount; nTriangle++)
{
int index0 = indices[nTriangle * 3 + 0];
int index1 = indices[nTriangle * 3 + 1];
int index2 = indices[nTriangle * 3 + 2];
Decal.Vertex vertex0 = vertices[index0];
Decal.Vertex vertex1 = vertices[index1];
Decal.Vertex vertex2 = vertices[index2];
Vec3 tangent = MathUtils.CalculateTangentSpaceVector(
vertex0.position, vertex0.texCoord,
vertex1.position, vertex1.texCoord,
vertex2.position, vertex2.texCoord);
vertex0.tangent += tangent;
vertex1.tangent += tangent;
vertex2.tangent += tangent;
vertices[index0] = vertex0;
vertices[index1] = vertex1;
vertices[index2] = vertex2;
}
for (int n = 0; n < vertices.Count; n++)
{
Decal.Vertex vertex = vertices[n];
if (vertex.tangent != Vec3.Zero)
{
vertex.tangent.Normalize();
}
vertices[n] = vertex;
}
}
//subtract decal position (make local vertices coordinates)
{
for (int n = 0; n < vertices.Count; n++)
{
Decal.Vertex vertex = vertices[n];
vertex.position -= Position;
vertices[n] = vertex;
}
}
//get material
string materialName = null;
{
string physicsMaterialName = startTriangle.shape.MaterialName;
string defaultMaterialName = "";
foreach (DecalCreatorType.MaterialItem item in Type.Materials)
{
if (item.PhysicsMaterialName == physicsMaterialName)
{
materialName = item.MaterialName;
}
if (string.IsNullOrEmpty(item.PhysicsMaterialName))
{
defaultMaterialName = item.MaterialName;
}
}
if (materialName == null)
{
materialName = defaultMaterialName;
}
}
//create Decal
Decal decal = (Decal)Entities.Instance.Create("Decal", Map.Instance);
decal.Position = Position;
decal.Init(this, vertices.ToArray(), indices.ToArray(), materialName, parentMapObject);
decal.PostCreate();
Type.AddDecalToCreatedList(decal);
decals.Add(decal);
}
void CreateDirectionalDecal(Shape shape, Vec3 pos, Vec3 normal, int triangleID)
{
bool smallDecal = Type.Size < .3f;
Body body = shape.Body;
//static objects
if (shape.ContactGroup == (int)ContactGroup.Collision)
{
ShapeTriangleID triangle = new ShapeTriangleID(shape, triangleID);
//StaticMesh
{
StaticMesh staticMesh = StaticMesh.GetStaticMeshByBody(body);
if (staticMesh != null)
{
if (staticMesh.AllowDecals == StaticMesh.DecalTypes.OnlySmall && smallDecal ||
staticMesh.AllowDecals == StaticMesh.DecalTypes.All)
{
CreateDecalForStaticObject(triangle, pos, normal, null);
return;
}
}
}
//HeightmapTerrain
if (HeightmapTerrain.GetTerrainByBody(body) != null)
{
CreateDecalForStaticObject(triangle, pos, normal, null);
return;
}
if (Type.ApplyToMapObjects)
{
//MapObject: Attached mesh
MapObject mapObject = MapSystemWorld.GetMapObjectByBody(body);
if (mapObject != null)
{
bool isCollision = false;
foreach (MapObjectAttachedObject attachedObject in mapObject.AttachedObjects)
{
MapObjectAttachedMesh attachedMesh = attachedObject as MapObjectAttachedMesh;
if (attachedMesh != null && attachedMesh.CollisionBody == body)
{
isCollision = true;
break;
}
}
if (isCollision)
{
CreateDecalForStaticObject(triangle, pos, normal, mapObject);
return;
}
}
}
}
//dynamic objects
{
//not implemented
}
}
