public static void GenerateRoadGeometryFromLine(this Mesh mesh, Scene scene, Vector3 lineStart, Vector3 lineEnd, float width = 1f, float height = 1f, string materialName = "pb_road", string edgeMaterialName = "pb_roadedge")
{
if (lineStart.X != lineEnd.X)
{
throw new ArgumentException("Vectors do not represent a 2D line!");
}
//
//float cubeLength = (lineEnd - lineStart).Length();
Vector3 forwardDir = Vector3.Normalize(lineEnd - lineStart);
Vector3 rightDir = Vector3.UnitX;
Vector3 upDir = -Vector3.Cross(forwardDir, rightDir);
Vector3 rightDirH = rightDir / 2f;
Vector3 upDirH = upDir / 2f;
//generate cube points
var cubeS_BLL = lineStart + (-rightDirH * width) + (-upDirH * height);
var cubeS_BRR = lineStart + (rightDirH * width) + (-upDirH * height);
var cubeS_TLL = lineStart + (-rightDirH * width) + (upDirH * height);
var cubeS_TRR = lineStart + (rightDirH * width) + (upDirH * height);
var cubeS_BL = Vector3.Lerp(cubeS_BLL, cubeS_BRR, 0.1f);
var cubeS_BR = Vector3.Lerp(cubeS_BRR, cubeS_BLL, 0.1f);
var cubeS_TL = Vector3.Lerp(cubeS_TLL, cubeS_TRR, 0.1f);
var cubeS_TR = Vector3.Lerp(cubeS_TRR, cubeS_TLL, 0.1f);
var cubeE_BLL = lineEnd + (-rightDirH * width) + (-upDirH * height);
var cubeE_BRR = lineEnd + (rightDirH * width) + (-upDirH * height);
var cubeE_TLL = lineEnd + (-rightDirH * width) + (upDirH * height);
var cubeE_TRR = lineEnd + (rightDirH * width) + (upDirH * height);
var cubeE_BL = Vector3.Lerp(cubeE_BLL, cubeE_BRR, 0.1f);
var cubeE_BR = Vector3.Lerp(cubeE_BRR, cubeE_BLL, 0.1f);
var cubeE_TL = Vector3.Lerp(cubeE_TLL, cubeE_TRR, 0.1f);
var cubeE_TR = Vector3.Lerp(cubeE_TRR, cubeE_TLL, 0.1f);
int vertexBase = mesh.Vertices.Count;
mesh.Vertices.Add(cubeS_BLL);
mesh.Vertices.Add(cubeS_BL);
mesh.Vertices.Add(cubeS_BR);
mesh.Vertices.Add(cubeS_BRR);
mesh.Vertices.Add(cubeS_TRR);
mesh.Vertices.Add(cubeS_TR);
mesh.Vertices.Add(cubeS_TL);
mesh.Vertices.Add(cubeS_TLL);
mesh.Vertices.Add(cubeE_BLL);
mesh.Vertices.Add(cubeE_BL);
mesh.Vertices.Add(cubeE_BR);
mesh.Vertices.Add(cubeE_BRR);
mesh.Vertices.Add(cubeE_TRR);
mesh.Vertices.Add(cubeE_TR);
mesh.Vertices.Add(cubeE_TL);
mesh.Vertices.Add(cubeE_TLL);
//find applicable submeshes
Submesh edgeSubmesh = mesh.GetOrCreateSubmesh(edgeMaterialName, scene);
Submesh roadSubmesh = mesh.GetOrCreateSubmesh(materialName, scene);
//left
edgeSubmesh.AddLoop(vertexBase);
edgeSubmesh.AddLoop(vertexBase + 7);
edgeSubmesh.AddLoop(vertexBase + 15);
edgeSubmesh.AddLoop(vertexBase + 8);
edgeSubmesh.AddLoop(vertexBase);
edgeSubmesh.AddLoop(vertexBase + 15);
//top 0
edgeSubmesh.AddLoop(vertexBase + 7);
edgeSubmesh.AddLoop(vertexBase + 6);
edgeSubmesh.AddLoop(vertexBase + 14);
edgeSubmesh.AddLoop(vertexBase + 15);
edgeSubmesh.AddLoop(vertexBase + 7);
edgeSubmesh.AddLoop(vertexBase + 14);
//top 1
roadSubmesh.AddLoop(vertexBase + 6);
roadSubmesh.AddLoop(vertexBase + 5);
roadSubmesh.AddLoop(vertexBase + 13);
roadSubmesh.AddLoop(vertexBase + 6);
roadSubmesh.AddLoop(vertexBase + 13);
roadSubmesh.AddLoop(vertexBase + 14);
//top 2
edgeSubmesh.AddLoop(vertexBase + 5);
edgeSubmesh.AddLoop(vertexBase + 4);
edgeSubmesh.AddLoop(vertexBase + 12);
edgeSubmesh.AddLoop(vertexBase + 13);
edgeSubmesh.AddLoop(vertexBase + 5);
edgeSubmesh.AddLoop(vertexBase + 12);
//right
edgeSubmesh.AddLoop(vertexBase + 3);
edgeSubmesh.AddLoop(vertexBase + 11);
edgeSubmesh.AddLoop(vertexBase + 12);
edgeSubmesh.AddLoop(vertexBase + 3);
edgeSubmesh.AddLoop(vertexBase + 12);
edgeSubmesh.AddLoop(vertexBase + 4);
//bottom 0
edgeSubmesh.AddLoop(vertexBase + 0);
edgeSubmesh.AddLoop(vertexBase + 8);
edgeSubmesh.AddLoop(vertexBase + 9);
edgeSubmesh.AddLoop(vertexBase + 9);
edgeSubmesh.AddLoop(vertexBase + 1);
edgeSubmesh.AddLoop(vertexBase + 0);
//bottom 1
roadSubmesh.AddLoop(vertexBase + 1);
roadSubmesh.AddLoop(vertexBase + 9);
roadSubmesh.AddLoop(vertexBase + 10);
roadSubmesh.AddLoop(vertexBase + 10);
roadSubmesh.AddLoop(vertexBase + 2);
roadSubmesh.AddLoop(vertexBase + 1);
//bottom 2
edgeSubmesh.AddLoop(vertexBase + 2);
edgeSubmesh.AddLoop(vertexBase + 10);
edgeSubmesh.AddLoop(vertexBase + 11);
edgeSubmesh.AddLoop(vertexBase + 11);
edgeSubmesh.AddLoop(vertexBase + 3);
edgeSubmesh.AddLoop(vertexBase + 2);
}
public static void GenerateCubeGeometryFromLine(this Mesh mesh, Scene scene, Vector3 lineStart, Vector3 lineEnd, float size = 1f, string materialName = "pb_wood")
{
if (lineStart.X != lineEnd.X)
{
throw new ArgumentException("Vectors do not represent a 2D line!");
}
//
//float cubeLength = (lineEnd - lineStart).Length();
Vector3 forwardDir = Vector3.Normalize(lineEnd - lineStart);
Vector3 rightDir = Vector3.UnitX;
Vector3 upDir = -Vector3.Cross(forwardDir, rightDir);
Vector3 rightDirH = rightDir / 2f;
Vector3 upDirH = upDir / 2f;
//generate cube points
var cubeS_BL = lineStart + (-rightDirH * size) + (-upDirH * size);
var cubeS_BR = lineStart + (rightDirH * size) + (-upDirH * size);
var cubeS_TL = lineStart + (-rightDirH * size) + (upDirH * size);
var cubeS_TR = lineStart + (rightDirH * size) + (upDirH * size);
var cubeE_BL = lineEnd + (-rightDirH * size) + (-upDirH * size);
var cubeE_BR = lineEnd + (rightDirH * size) + (-upDirH * size);
var cubeE_TL = lineEnd + (-rightDirH * size) + (upDirH * size);
var cubeE_TR = lineEnd + (rightDirH * size) + (upDirH * size);
int vertexBase = mesh.Vertices.Count;
mesh.Vertices.Add(cubeS_BL);
mesh.Vertices.Add(cubeS_BR);
mesh.Vertices.Add(cubeS_TR);
mesh.Vertices.Add(cubeS_TL);
mesh.Vertices.Add(cubeE_BL);
mesh.Vertices.Add(cubeE_BR);
mesh.Vertices.Add(cubeE_TR);
mesh.Vertices.Add(cubeE_TL);
//find applicable submeshes
Submesh submesh = mesh.GetOrCreateSubmesh(materialName, scene);
//left
submesh.AddLoop(vertexBase);
submesh.AddLoop(vertexBase + 3);
submesh.AddLoop(vertexBase + 7);
submesh.AddLoop(vertexBase + 4);
submesh.AddLoop(vertexBase);
submesh.AddLoop(vertexBase + 7);
//top
submesh.AddLoop(vertexBase + 3);
submesh.AddLoop(vertexBase + 2);
submesh.AddLoop(vertexBase + 6);
submesh.AddLoop(vertexBase + 7);
submesh.AddLoop(vertexBase + 3);
submesh.AddLoop(vertexBase + 6);
//bottom
submesh.AddLoop(vertexBase + 0);
submesh.AddLoop(vertexBase + 4);
submesh.AddLoop(vertexBase + 5);
submesh.AddLoop(vertexBase + 5);
submesh.AddLoop(vertexBase + 1);
submesh.AddLoop(vertexBase + 0);
//right
submesh.AddLoop(vertexBase + 1);
submesh.AddLoop(vertexBase + 5);
submesh.AddLoop(vertexBase + 6);
submesh.AddLoop(vertexBase + 1);
submesh.AddLoop(vertexBase + 6);
submesh.AddLoop(vertexBase + 2);
}
