/// <summary>
/// Builds cube sides into this Geometry (these sides are built up of 16 vertices, so texture coordinates and normals are set)
/// </summary>
/// <param name="target">Target <see cref="GeometrySurface"/>.</param>
/// <param name="start">Start point of the cube</param>
/// <param name="size">Size of the cube</param>
public static BuiltVerticesRange BuildCubeSides(this GeometrySurface target, Vector3 start, Vector3 size)
{
var result = new BuiltVerticesRange(target.Owner)
{
StartVertex = target.Owner.CountVertices
};
var dest = start + size;
var texX = 1f;
var texY = 1f;
var texZ = 1f;
if (target.IsTextureTileModeEnabled(out var tileSize))
{
texX = size.X / tileSize.X;
texY = size.Y / tileSize.Y;
texZ = size.Z / tileSize.X;
}
//Front side
var vertex = new VertexBasic(start, new Vector2(0f, texY), new Vector3(0f, 0f, -1f));
var a = target.Owner.AddVertex(vertex);
var b = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, start.Y, start.Z), new Vector2(texX, texY)));
var c = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, dest.Y, start.Z), new Vector2(texX, 0f)));
var d = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, dest.Y, start.Z), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
//Right side
a = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, start.Y, start.Z), new Vector3(1f, 0f, 0f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, start.Y, dest.Z), new Vector3(1f, 0f, 0f), new Vector2(texZ, texY)));
c = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, dest.Y, dest.Z), new Vector3(1f, 0f, 0f), new Vector2(texZ, 0f)));
d = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, dest.Y, start.Z), new Vector3(1f, 0f, 0f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
//Back side
a = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, start.Y, dest.Z), new Vector3(0f, 0f, 1f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, start.Y, dest.Z), new Vector3(0f, 0f, 1f), new Vector2(texX, texY)));
c = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, dest.Y, dest.Z), new Vector3(0f, 0f, 1f), new Vector2(texX, 0f)));
d = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, dest.Y, dest.Z), new Vector3(0f, 0f, 1f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
//Left side
a = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, start.Y, dest.Z), new Vector3(-1f, 0f, 0f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, start.Y, start.Z), new Vector3(-1f, 0f, 0f), new Vector2(texZ, texY)));
c = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, dest.Y, start.Z), new Vector3(-1f, 0f, 0f), new Vector2(texZ, 0f)));
d = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, dest.Y, dest.Z), new Vector3(-1f, 0f, 0f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
result.VertexCount = target.Owner.CountVertices - result.StartVertex;
return(result);
}
/// <summary>
/// Builds a cube into this Geometry (this cube is built up of 24 vertices, so texture coordinates and normals are set)
/// </summary>
/// <param name="target">Target <see cref="GeometrySurface"/>.</param>
/// <param name="start">Start point of the cube</param>
/// <param name="size">Size of the cube</param>
public static BuiltVerticesRange BuildCube(this GeometrySurface target, Vector3 start, Vector3 size)
{
var result = new BuiltVerticesRange(target.Owner);
result.Merge(target.BuildCubeSides(start, size));
result.Merge(target.BuildCubeTop(start, size));
result.Merge(target.BuildCubeBottom(start, size));
return(result);
}
/// <summary>
/// Builds a cube of 4 vertices and a defined height.
/// </summary>
public static BuiltVerticesRange BuildCube(this GeometrySurface target, Vector3 topA, Vector3 topB, Vector3 topC, Vector3 topD, float height)
{
var result = new BuiltVerticesRange(target.Owner)
{
StartVertex = target.Owner.CountVertices
};
var startTriangleIndex = target.CountTriangles;
// Calculate texture coordinates
var size = new Vector3(
(topB - topA).Length(),
Math.Abs(height),
(topC - topB).Length());
var texX = 1f;
var texY = 1f;
var texZ = 1f;
if (target.IsTextureTileModeEnabled(out var tileSize))
{
texX = size.X / tileSize.X;
texY = size.Y / tileSize.Y;
texZ = size.Z / tileSize.X;
}
// Calculate bottom vectors
var bottomA = new Vector3(topA.X, topA.Y - height, topA.Z);
var bottomB = new Vector3(topB.X, topB.Y - height, topB.Z);
var bottomC = new Vector3(topC.X, topC.Y - height, topC.Z);
var bottomD = new Vector3(topD.X, topD.Y - height, topD.Z);
// Build Top side
var vertex = new VertexBasic(topA, new Vector2(texX, 0f), new Vector3(0f, 1f, 0f));
var a = target.Owner.AddVertex(vertex);
var b = target.Owner.AddVertex(vertex.Copy(topB, new Vector2(texX, texY)));
var c = target.Owner.AddVertex(vertex.Copy(topC, new Vector2(0f, texY)));
var d = target.Owner.AddVertex(vertex.Copy(topD, new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Build Bottom side
vertex = new VertexBasic(topA, new Vector2(0f, 0f), new Vector3(0f, -1f, 0f));
a = target.Owner.AddVertex(vertex);
b = target.Owner.AddVertex(vertex.Copy(topD, new Vector2(texX, 0f)));
c = target.Owner.AddVertex(vertex.Copy(topC, new Vector2(texX, texY)));
d = target.Owner.AddVertex(vertex.Copy(topB, new Vector2(0f, texY)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Build Front side
vertex = new VertexBasic(topA, new Vector2(0f, texY), new Vector3(0f, 0f, -1f));
a = target.Owner.AddVertex(vertex);
b = target.Owner.AddVertex(vertex.Copy(topB, new Vector2(texX, texY)));
c = target.Owner.AddVertex(vertex.Copy(bottomB, new Vector2(texX, 0f)));
d = target.Owner.AddVertex(vertex.Copy(bottomA, new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Build Right side
a = target.Owner.AddVertex(vertex.Copy(topB, new Vector3(1f, 0f, 0f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(topC, new Vector3(1f, 0f, 0f), new Vector2(texZ, texY)));
c = target.Owner.AddVertex(vertex.Copy(bottomC, new Vector3(1f, 0f, 0f), new Vector2(texZ, 0f)));
d = target.Owner.AddVertex(vertex.Copy(bottomB, new Vector3(1f, 0f, 0f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Build Back side
a = target.Owner.AddVertex(vertex.Copy(topC, new Vector3(0f, 0f, 1f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(topD, new Vector3(0f, 0f, 1f), new Vector2(texX, texY)));
c = target.Owner.AddVertex(vertex.Copy(bottomD, new Vector3(0f, 0f, 1f), new Vector2(texX, 0f)));
d = target.Owner.AddVertex(vertex.Copy(bottomC, new Vector3(0f, 0f, 1f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Build Left side
a = target.Owner.AddVertex(vertex.Copy(topD, new Vector3(-1f, 0f, 0f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(topA, new Vector3(-1f, 0f, 0f), new Vector2(texZ, texY)));
c = target.Owner.AddVertex(vertex.Copy(bottomA, new Vector3(-1f, 0f, 0f), new Vector2(texZ, 0f)));
d = target.Owner.AddVertex(vertex.Copy(bottomD, new Vector3(-1f, 0f, 0f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Calculate normals finally
target.CalculateNormalsFlat(startTriangleIndex, target.CountTriangles - startTriangleIndex);
result.VertexCount = target.Owner.CountVertices - result.StartVertex;
return(result);
}
