From c1d3e93fbb3284b38b85294d43189001bfce5214 Mon Sep 17 00:00:00 2001 From: dan miller Date: Sat, 29 Sep 2007 04:08:33 +0000 Subject: [PATCH] Hollow prims (box only), thanks Gerard! Enjoy --- .../OdePlugin/Meshing\\/HelperTypes.cs" | 279 +++++++++ .../OdePlugin/Meshing\\/Meshmerizer.cs" | 560 ++++++++++++++++++ 2 files changed, 839 insertions(+) create mode 100644 "OpenSim/Region/Physics/OdePlugin/Meshing\\/HelperTypes.cs" create mode 100644 "OpenSim/Region/Physics/OdePlugin/Meshing\\/Meshmerizer.cs" diff --git "a/OpenSim/Region/Physics/OdePlugin/Meshing\\/HelperTypes.cs" "b/OpenSim/Region/Physics/OdePlugin/Meshing\\/HelperTypes.cs" new file mode 100644 index 0000000000..3d40c0451b --- /dev/null +++ "b/OpenSim/Region/Physics/OdePlugin/Meshing\\/HelperTypes.cs" @@ -0,0 +1,279 @@ +using System; +using System.Globalization; +using System.Diagnostics; +using System.Collections.Generic; + +using OpenSim.Region.Physics.Manager; + +public class Vertex : IComparable +{ + public String name; + public PhysicsVector point; + + public Vertex(String name, float x, float y, float z) + { + this.name = name; + point = new PhysicsVector(x, y, z); + } + + public int CompareTo(Vertex other) + { + if (point.X < other.point.X) + return -1; + + if (point.X > other.point.X) + return 1; + + if (point.Y < other.point.Y) + return -1; + + if (point.Y > other.point.Y) + return 1; + + if (point.Z < other.point.Z) + return -1; + + if (point.Z > other.point.Z) + return 1; + + return 0; + } + + public static bool operator >(Vertex me, Vertex other) + { + return me.CompareTo(other) > 0; + } + + public static bool operator <(Vertex me, Vertex other) + { + return me.CompareTo(other) < 0; + } + + +} + +public class Simplex : IComparable +{ + public Vertex v1; + public Vertex v2; + + public Simplex(Vertex _v1, Vertex _v2) + { + // Presort indices to make sorting (comparing) easier + if (_v1 > _v2) + { + v1 = _v1; + v2 = _v2; + } + else + { + v1 = _v2; + v2 = _v1; + } + } + + public int CompareTo(Simplex other) + { + if (v1 > other.v1) + { + return 1; + } + if (v1 < other.v1) + { + return -1; + } + + if (v2 > other.v2) + { + return 1; + } + if (v2 < other.v2) + { + return -1; + } + + return 0; + } + +}; + +public class Triangle +{ + public Vertex v1; + public Vertex v2; + public Vertex v3; + + float radius_square; + float cx; + float cy; + + public Triangle(Vertex _v1, Vertex _v2, Vertex _v3) + { + v1 = _v1; + v2 = _v2; + v3 = _v3; + + CalcCircle(); + } + + public bool isInCircle(float x, float y) + { + float dx, dy; + float dd; + + dx = x - this.cx; + dy = y - this.cy; + + dd = dx * dx + dy * dy; + if (dd < this.radius_square) + return true; + else + return false; + } + + + void CalcCircle() + { + // Calculate the center and the radius of a circle given by three points p1, p2, p3 + // It is assumed, that the triangles vertices are already set correctly + double p1x, p2x, p1y, p2y, p3x, p3y; + + // Deviation of this routine: + // A circle has the general equation (M-p)^2=r^2, where M and p are vectors + // this gives us three equations f(p)=r^2, each for one point p1, p2, p3 + // putting respectively two equations together gives two equations + // f(p1)=f(p2) and f(p1)=f(p3) + // bringing all constant terms to one side brings them to the form + // M*v1=c1 resp.M*v2=c2 where v1=(p1-p2) and v2=(p1-p3) (still vectors) + // and c1, c2 are scalars (Naming conventions like the variables below) + // Now using the equations that are formed by the components of the vectors + // and isolate Mx lets you make one equation that only holds My + // The rest is straight forward and eaasy :-) + // + + /* helping variables for temporary results */ + double c1, c2; + double v1x, v1y, v2x, v2y; + + double z, n; + + double rx, ry; + + // Readout the three points, the triangle consists of + p1x = v1.point.X; + p1y = v1.point.Y; + + p2x = v2.point.X; + p2y = v2.point.Y; + + p3x = v3.point.X; + p3y = v3.point.Y; + + /* calc helping values first */ + c1 = (p1x * p1x + p1y * p1y - p2x * p2x - p2y * p2y) / 2; + c2 = (p1x * p1x + p1y * p1y - p3x * p3x - p3y * p3y) / 2; + + v1x = p1x - p2x; + v1y = p1y - p2y; + + v2x = p1x - p3x; + v2y = p1y - p3y; + + z = (c1 * v2x - c2 * v1x); + n = (v1y * v2x - v2y * v1x); + + if (n == 0.0) // This is no triangle, i.e there are (at least) two points at the same location + { + radius_square = 0.0f; + return; + } + + this.cy = (float)(z / n); + + if (v2x != 0.0) + { + this.cx = (float)((c2 - v2y * this.cy) / v2x); + } + else if (v1x != 0.0) + { + this.cx = (float)((c1 - v1y * this.cy) / v1x); + } + else + { + Debug.Assert(false, "Malformed triangle"); /* Both terms zero means nothing good */ + } + + rx = (p1x - this.cx); + ry = (p1y - this.cy); + + this.radius_square = (float)(rx * rx + ry * ry); + + } + + public List GetSimplices() + { + List result = new List(); + Simplex s1 = new Simplex(v1, v2); + Simplex s2 = new Simplex(v2, v3); + Simplex s3 = new Simplex(v3, v1); + + result.Add(s1); + result.Add(s2); + result.Add(s3); + + return result; + } + + public override String ToString() + { + + NumberFormatInfo nfi = new NumberFormatInfo(); + nfi.CurrencyDecimalDigits = 2; + nfi.CurrencyDecimalSeparator = "."; + + String s1 = "<" + v1.point.X.ToString(nfi) + "," + v1.point.Y.ToString(nfi) + "," + v1.point.Z.ToString(nfi) + ">"; + String s2 = "<" + v2.point.X.ToString(nfi) + "," + v2.point.Y.ToString(nfi) + "," + v2.point.Z.ToString(nfi) + ">"; + String s3 = "<" + v3.point.X.ToString(nfi) + "," + v3.point.Y.ToString(nfi) + "," + v3.point.Z.ToString(nfi) + ">"; + + return s1 + ";" + s2 + ";" + s3; + + } + + public PhysicsVector getNormal() + { + // Vertices + + // Vectors for edges + PhysicsVector e1; + PhysicsVector e2; + + e1 = new PhysicsVector(v1.point.X - v2.point.X, v1.point.Y - v2.point.Y, v1.point.Z - v2.point.Z); + e2 = new PhysicsVector(v1.point.X - v3.point.X, v1.point.Y - v3.point.Y, v1.point.Z - v3.point.Z); + + // Cross product for normal + PhysicsVector n = new PhysicsVector(); + float nx, ny, nz; + n.X = e1.Y * e2.Z - e1.Z * e2.Y; + n.Y = e1.Z * e2.X - e1.X * e2.Z; + n.Z = e1.X * e2.Y - e1.Y * e2.X; + + // Length + float l = (float)Math.Sqrt(n.X * n.X + n.Y * n.Y + n.Z * n.Z); + + // Normalized "normal" + n.X /= l; + n.Y /= l; + n.Z /= l; + + return n; + } + + public void invertNormal() + { + Vertex vt; + vt = v1; + v1 = v2; + v2 = vt; + } +} + diff --git "a/OpenSim/Region/Physics/OdePlugin/Meshing\\/Meshmerizer.cs" "b/OpenSim/Region/Physics/OdePlugin/Meshing\\/Meshmerizer.cs" new file mode 100644 index 0000000000..28dca412fb --- /dev/null +++ "b/OpenSim/Region/Physics/OdePlugin/Meshing\\/Meshmerizer.cs" @@ -0,0 +1,560 @@ +using System; +using System.Globalization; +using System.Diagnostics; +using System.Collections.Generic; +using System.Text; +using System.Runtime.InteropServices; + +using OpenSim.Framework.Types; +using OpenSim.Region.Physics.Manager; + +namespace OpenSim.Region.Physics.OdePlugin +{ + public class Mesh + { + public List vertices; + public List triangles; + + public float[] normals; + + public Mesh() + { + vertices = new List(); + triangles = new List(); + } + + public void Add(Triangle triangle) + { + int i; + i = vertices.IndexOf(triangle.v1); + if (i < 0) + throw new ArgumentException("Vertex v1 not known to mesh"); + i = vertices.IndexOf(triangle.v2); + if (i < 0) + throw new ArgumentException("Vertex v2 not known to mesh"); + i = vertices.IndexOf(triangle.v3); + if (i < 0) + throw new ArgumentException("Vertex v3 not known to mesh"); + + triangles.Add(triangle); + } + + public void Add(Vertex v) + { + vertices.Add(v); + } + + + public float[] getVertexListAsFloat() + { + float[] result = new float[vertices.Count * 3]; + for (int i = 0; i < vertices.Count; i++) + { + Vertex v = vertices[i]; + PhysicsVector point = v.point; + result[3 * i + 0] = point.X; + result[3 * i + 1] = point.Y; + result[3 * i + 2] = point.Z; + } + GCHandle.Alloc(result, GCHandleType.Pinned); + return result; + } + + public int[] getIndexListAsInt() + { + int[] result = new int[triangles.Count * 3]; + for (int i = 0; i < triangles.Count; i++) + { + Triangle t = triangles[i]; + result[3 * i + 0] = vertices.IndexOf(t.v1); + result[3 * i + 1] = vertices.IndexOf(t.v2); + result[3 * i + 2] = vertices.IndexOf(t.v3); + } + GCHandle.Alloc(result, GCHandleType.Pinned); + return result; + } + + + public void Append(Mesh newMesh) + { + foreach (Vertex v in newMesh.vertices) + vertices.Add(v); + + foreach (Triangle t in newMesh.triangles) + Add(t); + + } + } + + + + public class Meshmerizer + { + + static List FindInfluencedTriangles(List triangles, Vertex v) + { + List influenced = new List(); + foreach (Triangle t in triangles) + { + float dx, dy; + + if (t.isInCircle(v.point.X, v.point.Y)) + { + influenced.Add(t); + } + } + return influenced; + } + + + static void InsertVertices(List vertices, int usedForSeed, List triangles, List innerBorders) + { + // This is a variant of the delaunay algorithm + // each time a new vertex is inserted, all triangles that are influenced by it are deleted + // and replaced by new ones including the new vertex + // It is not very time efficient but easy to implement. + + int iCurrentVertex; + int iMaxVertex=vertices.Count; + for (iCurrentVertex = usedForSeed; iCurrentVertex < iMaxVertex; iCurrentVertex++) + { + // Background: A triangle mesh fulfills the delaunay condition if (iff!) + // each circumlocutory circle (i.e. the circle that touches all three corners) + // of each triangle is empty of other vertices. + // Obviously a single (seeding) triangle fulfills this condition. + // If we now add one vertex, we need to reconstruct all triangles, that + // do not fulfill this condition with respect to the new triangle + + // Find the triangles that are influenced by the new vertex + Vertex v=vertices[iCurrentVertex]; + List influencedTriangles=FindInfluencedTriangles(triangles, v); + + List simplices = new List(); + + // Reconstruction phase. First step, dissolve each triangle into it's simplices, + // i.e. it's "border lines" + // Goal is to find "inner" borders and delete them, while the hull gets conserved. + // Inner borders are special in the way that they always come twice, which is how we detect them + foreach (Triangle t in influencedTriangles) + { + List newSimplices = t.GetSimplices(); + simplices.AddRange(newSimplices); + triangles.Remove(t); + } + // Now sort the simplices. That will make identical ones side by side in the list + simplices.Sort(); + + // Look for duplicate simplices here. + // Remember, they are directly side by side in the list right now + int iSimplex; + List innerSimplices=new List(); + for (iSimplex = 1; iSimplex < simplices.Count; iSimplex++) // Startindex=1, so we can refer backwards + { + if (simplices[iSimplex - 1].CompareTo(simplices[iSimplex])==0) + { + innerSimplices.Add(simplices[iSimplex - 1]); + innerSimplices.Add(simplices[iSimplex]); + } + } + + foreach (Simplex s in innerSimplices) + { + simplices.Remove(s); + } + + // each simplex still in the list belongs to the hull of the region in question + // The new vertex (yes, we still deal with verices here :-) ) forms a triangle + // With each of these simplices. Build the new triangles and add them to the list + foreach (Simplex s in simplices) + { + Triangle t = new Triangle(s.v1, s.v2, vertices[iCurrentVertex]); + triangles.Add(t); + } + } + + // At this point all vertices should be inserted into the mesh + // But the areas, that should be kept free still are filled with triangles + // We have to remove them. For this we have a list of indices to vertices. + // Each triangle that solemnly constists of vertices from the inner border + // are deleted + + List innerTriangles = new List(); + foreach (Triangle t in triangles) + { + if ( + innerBorders.Contains(vertices.IndexOf(t.v1)) + && innerBorders.Contains(vertices.IndexOf(t.v2)) + && innerBorders.Contains(vertices.IndexOf(t.v3)) + ) + innerTriangles.Add(t); + } + foreach (Triangle t in innerTriangles) + { + triangles.Remove(t); + } + } + + + static Mesh CreateBoxMeshX(PrimitiveBaseShape primShape, PhysicsVector size) + // Builds the x (+ and -) surfaces of a box shaped prim + { + UInt16 hollowFactor = primShape.ProfileHollow; + Mesh meshMX = new Mesh(); + + + // Surface 0, -X + meshMX.Add(new Vertex("-X-Y-Z", -size.X / 2.0f, -size.Y / 2.0f, -size.Z / 2.0f)); + meshMX.Add(new Vertex("-X+Y-Z", -size.X / 2.0f, +size.Y / 2.0f, -size.Z / 2.0f)); + meshMX.Add(new Vertex("-X-Y+Z", -size.X / 2.0f, -size.Y / 2.0f, +size.Z / 2.0f)); + meshMX.Add(new Vertex("-X+Y+Z", -size.X / 2.0f, +size.Y / 2.0f, +size.Z / 2.0f)); + + meshMX.Add(new Triangle(meshMX.vertices[0], meshMX.vertices[2], meshMX.vertices[1])); + meshMX.Add(new Triangle(meshMX.vertices[1], meshMX.vertices[2], meshMX.vertices[3])); + + + Mesh meshPX = new Mesh(); + // Surface 1, +X + meshPX.Add(new Vertex("+X-Y-Z", +size.X / 2.0f, -size.Y / 2.0f, -size.Z / 2.0f)); + meshPX.Add(new Vertex("+X+Y-Z", +size.X / 2.0f, +size.Y / 2.0f, -size.Z / 2.0f)); + meshPX.Add(new Vertex("+X-Y+Z", +size.X / 2.0f, -size.Y / 2.0f, +size.Z / 2.0f)); + meshPX.Add(new Vertex("+X+Y+Z", +size.X / 2.0f, +size.Y / 2.0f, +size.Z / 2.0f)); + + + meshPX.Add(new Triangle(meshPX.vertices[0], meshPX.vertices[1], meshPX.vertices[2])); + meshPX.Add(new Triangle(meshPX.vertices[2], meshPX.vertices[1], meshPX.vertices[3])); + + + if (hollowFactor > 0) + { + float hollowFactorF = (float)hollowFactor / (float)50000; + + Vertex IPP; + Vertex IPM; + Vertex IMP; + Vertex IMM; + + IPP = new Vertex("Inner-X+Y+Z", -size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, +size.Z / 2.0f); + IPM = new Vertex("Inner-X+Y-Z", -size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, -size.Z / 2.0f); + IMP = new Vertex("Inner-X-Y+Z", -size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, +size.Z / 2.0f); + IMM = new Vertex("Inner-X-Y-Z", -size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, -size.Z / 2.0f); + + meshMX.Add(IPP); + meshMX.Add(IPM); + meshMX.Add(IMP); + meshMX.Add(IMM); + + meshMX.Add(new Triangle(IPP, IMP, IPM)); + meshMX.Add(new Triangle(IPM, IMP, IMM)); + + foreach (Triangle t in meshMX.triangles) + { + PhysicsVector n = t.getNormal(); + } + + + + IPP = new Vertex("Inner+X+Y+Z", +size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, +size.Z / 2.0f); + IPM = new Vertex("Inner+X+Y-Z", +size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, -size.Z / 2.0f); + IMP = new Vertex("Inner+X-Y+Z", +size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, +size.Z / 2.0f); + IMM = new Vertex("Inner+X-Y-Z", +size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, -size.Z / 2.0f); + + meshPX.Add(IPP); + meshPX.Add(IPM); + meshPX.Add(IMP); + meshPX.Add(IMM); + + meshPX.Add(new Triangle(IPP, IPM, IMP)); + meshPX.Add(new Triangle(IMP, IPM, IMM)); + + foreach (Triangle t in meshPX.triangles) + { + PhysicsVector n = t.getNormal(); + } + } + + Mesh result = new Mesh(); + result.Append(meshMX); + result.Append(meshPX); + + return result; + } + + + + static Mesh CreateBoxMeshY(PrimitiveBaseShape primShape, PhysicsVector size) + // Builds the y (+ and -) surfaces of a box shaped prim + { + UInt16 hollowFactor = primShape.ProfileHollow; + + // (M)inus Y + Mesh MeshMY = new Mesh(); + MeshMY.Add(new Vertex("-X-Y-Z", -size.X / 2.0f, -size.Y / 2.0f, -size.Z / 2.0f)); + MeshMY.Add(new Vertex("+X-Y-Z", +size.X / 2.0f, -size.Y / 2.0f, -size.Z / 2.0f)); + MeshMY.Add(new Vertex("-X-Y+Z", -size.X / 2.0f, -size.Y / 2.0f, +size.Z / 2.0f)); + MeshMY.Add(new Vertex("+X-Y+Z", +size.X / 2.0f, -size.Y / 2.0f, +size.Z / 2.0f)); + + MeshMY.Add(new Triangle(MeshMY.vertices[0], MeshMY.vertices[1], MeshMY.vertices[2])); + MeshMY.Add(new Triangle(MeshMY.vertices[2], MeshMY.vertices[1], MeshMY.vertices[3])); + + // (P)lus Y + Mesh MeshPY = new Mesh(); + + MeshPY.Add(new Vertex("-X+Y-Z", -size.X / 2.0f, +size.Y / 2.0f, -size.Z / 2.0f)); + MeshPY.Add(new Vertex("+X+Y-Z", +size.X / 2.0f, +size.Y / 2.0f, -size.Z / 2.0f)); + MeshPY.Add(new Vertex("-X+Y+Z", -size.X / 2.0f, +size.Y / 2.0f, +size.Z / 2.0f)); + MeshPY.Add(new Vertex("+X+Y+Z", +size.X / 2.0f, +size.Y / 2.0f, +size.Z / 2.0f)); + + MeshPY.Add(new Triangle(MeshPY.vertices[1], MeshPY.vertices[0], MeshPY.vertices[2])); + MeshPY.Add(new Triangle(MeshPY.vertices[1], MeshPY.vertices[2], MeshPY.vertices[3])); + + if (hollowFactor > 0) + { + float hollowFactorF = (float)hollowFactor / (float)50000; + + Vertex IPP; + Vertex IPM; + Vertex IMP; + Vertex IMM; + + IPP = new Vertex("Inner+X-Y+Z", +size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, +size.Z / 2.0f); + IPM = new Vertex("Inner+X-Y-Z", +size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, -size.Z / 2.0f); + IMP = new Vertex("Inner-X-Y+Z", -size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, +size.Z / 2.0f); + IMM = new Vertex("Inner-X-Y-Z", -size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, -size.Z / 2.0f); + + MeshMY.Add(IPP); + MeshMY.Add(IPM); + MeshMY.Add(IMP); + MeshMY.Add(IMM); + + MeshMY.Add(new Triangle(IPP, IPM, IMP)); + MeshMY.Add(new Triangle(IMP, IPM, IMM)); + + foreach (Triangle t in MeshMY.triangles) + { + PhysicsVector n = t.getNormal(); + } + + + + IPP = new Vertex("Inner+X+Y+Z", +size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, +size.Z / 2.0f); + IPM=new Vertex("Inner+X+Y-Z", +size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, -size.Z / 2.0f); + IMP=new Vertex("Inner-X+Y+Z", -size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, +size.Z / 2.0f); + IMM=new Vertex("Inner-X+Y-Z", -size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, -size.Z / 2.0f); + + MeshPY.Add(IPP); + MeshPY.Add(IPM); + MeshPY.Add(IMP); + MeshPY.Add(IMM); + + MeshPY.Add(new Triangle(IPM, IPP, IMP)); + MeshPY.Add(new Triangle(IMP, IMM, IPM)); + + foreach (Triangle t in MeshPY.triangles) + { + PhysicsVector n = t.getNormal(); + } + + + + } + + + Mesh result = new Mesh(); + result.Append(MeshMY); + result.Append(MeshPY); + + return result; + } + + static Mesh CreateBoxMeshZ(PrimitiveBaseShape primShape, PhysicsVector size) + // Builds the z (+ and -) surfaces of a box shaped prim + { + UInt16 hollowFactor = primShape.ProfileHollow; + + // Base, i.e. outer shape + // (M)inus Z + Mesh MZ = new Mesh(); + + MZ.Add(new Vertex("-X-Y-Z", -size.X / 2.0f, -size.Y / 2.0f, -size.Z / 2.0f)); + MZ.Add(new Vertex("+X-Y-Z", +size.X / 2.0f, -size.Y / 2.0f, -size.Z / 2.0f)); + MZ.Add(new Vertex("-X+Y-Z", -size.X / 2.0f, +size.Y / 2.0f, -size.Z / 2.0f)); + MZ.Add(new Vertex("+X+Y-Z", +size.X / 2.0f, +size.Y / 2.0f, -size.Z / 2.0f)); + + + MZ.Add(new Triangle(MZ.vertices[1], MZ.vertices[0], MZ.vertices[2])); + MZ.Add(new Triangle(MZ.vertices[1], MZ.vertices[2], MZ.vertices[3])); + + // (P)lus Z + Mesh PZ = new Mesh(); + + PZ.Add(new Vertex("-X-Y+Z", -size.X / 2.0f, -size.Y / 2.0f, 0.0f)); + PZ.Add(new Vertex("+X-Y+Z", +size.X / 2.0f, -size.Y / 2.0f, 0.0f)); + PZ.Add(new Vertex("-X+Y+Z", -size.X / 2.0f, +size.Y / 2.0f, 0.0f)); + PZ.Add(new Vertex("+X+Y+Z", +size.X / 2.0f, +size.Y / 2.0f, 0.0f)); + + // Surface 5, +Z + PZ.Add(new Triangle(PZ.vertices[0], PZ.vertices[1], PZ.vertices[2])); + PZ.Add(new Triangle(PZ.vertices[2], PZ.vertices[1], PZ.vertices[3])); + + if (hollowFactor > 0) + { + float hollowFactorF = (float)hollowFactor / (float)50000; + + MZ.Add(new Vertex("-X-Y-Z", -size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, 0.0f)); + MZ.Add(new Vertex("-X+Y-Z", +size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, 0.0f)); + MZ.Add(new Vertex("-X-Y+Z", -size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, 0.0f)); + MZ.Add(new Vertex("-X+Y+Z", +size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, 0.0f)); + + List innerBorders = new List(); + innerBorders.Add(4); + innerBorders.Add(5); + innerBorders.Add(6); + innerBorders.Add(7); + + InsertVertices(MZ.vertices, 4, MZ.triangles, innerBorders); + + PZ.Add(new Vertex("-X-Y-Z", -size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, 0.0f)); + PZ.Add(new Vertex("-X+Y-Z", +size.X * hollowFactorF / 2.0f, -size.Y * hollowFactorF / 2.0f, 0.0f)); + PZ.Add(new Vertex("-X-Y+Z", -size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, 0.0f)); + PZ.Add(new Vertex("-X+Y+Z", +size.X * hollowFactorF / 2.0f, +size.Y * hollowFactorF / 2.0f, 0.0f)); + + innerBorders = new List(); + innerBorders.Add(4); + innerBorders.Add(5); + innerBorders.Add(6); + innerBorders.Add(7); + + InsertVertices(PZ.vertices, 4, PZ.triangles, innerBorders); + + } + + foreach (Vertex v in PZ.vertices) + { + v.point.Z = size.Z / 2.0f; + } + foreach (Vertex v in MZ.vertices) + { + v.point.Z = -size.Z / 2.0f; + } + + foreach (Triangle t in MZ.triangles) + { + PhysicsVector n = t.getNormal(); + if (n.Z > 0.0) + t.invertNormal(); + } + + foreach (Triangle t in PZ.triangles) + { + PhysicsVector n = t.getNormal(); + if (n.Z < 0.0) + t.invertNormal(); + } + + Mesh result = new Mesh(); + result.Append(MZ); + result.Append(PZ); + + return result; + } + + static Mesh CreateBoxMesh(PrimitiveBaseShape primShape, PhysicsVector size) + { + Mesh result = new Mesh(); + + + + Mesh MeshX = Meshmerizer.CreateBoxMeshX(primShape, size); + Mesh MeshY = Meshmerizer.CreateBoxMeshY(primShape, size); + Mesh MeshZ = Meshmerizer.CreateBoxMeshZ(primShape, size); + + result.Append(MeshX); + result.Append(MeshY); + result.Append(MeshZ); + + return result; + } + + + public static void CalcNormals(Mesh mesh) + { + int iTriangles = mesh.triangles.Count; + + mesh.normals = new float[iTriangles*3]; + + int i=0; + foreach (Triangle t in mesh.triangles) + { + + float ux, uy, uz; + float vx, vy, vz; + float wx, wy, wz; + + ux = t.v1.point.X; + uy = t.v1.point.Y; + uz = t.v1.point.Z; + + vx = t.v2.point.X; + vy = t.v2.point.Y; + vz = t.v2.point.Z; + + wx = t.v3.point.X; + wy = t.v3.point.Y; + wz = t.v3.point.Z; + + // Vectors for edges + float e1x, e1y, e1z; + float e2x, e2y, e2z; + + e1x = ux - vx; + e1y = uy - vy; + e1z = uz - vz; + + e2x = ux - wx; + e2y = uy - wy; + e2z = uz - wz; + + + // Cross product for normal + float nx, ny, nz; + nx = e1y * e2z - e1z * e2y; + ny = e1z * e2x - e1x * e2z; + nz = e1x * e2y - e1y * e2x; + + // Length + float l = (float)Math.Sqrt(nx * nx + ny * ny + nz * nz); + + // Normalized "normal" + nx /= l; + ny /= l; + nz /= l; + + mesh.normals[i] = nx; + mesh.normals[i + 1] = ny; + mesh.normals[i + 2] = nz; + + i+=3; + } + } + + public static Mesh CreateMesh(PrimitiveBaseShape primShape, PhysicsVector size) + { + Mesh mesh = null; + + switch (primShape.ProfileShape) + { + case ProfileShape.Square: + mesh=CreateBoxMesh(primShape, size); + CalcNormals(mesh); + break; + default: + mesh=null; + break; + } + + return mesh; + + } + } +} +