public DualContouringTestEnvironment()
{
cellSize = 0.5f;
lines = new LineManager3DLines(TW.Graphics.Device);
this.lines.SetMaxLines(1000000);
PlaceableObjectGrid = new IntersectableCube();
cameraLightSimulator = new CameraLightSimulator();
surfaceRenderer = VoxelCustomRenderer.CreateDefault(TW.Graphics);
TW.Graphics.AcquireRenderer().AddCustomGBufferRenderer(surfaceRenderer);
}
/// <summary>
///
/// </summary>
/// <param name="gridWorldSize">Size of the grid in world space</param>
/// <param name="resolution">Aka the subdivision of the grid</param>
/// <param name="world">Worldmatrix of the object</param>
/// <param name="obj"></param>
/// <returns></returns>
public static HermiteDataGrid FromIntersectableGeometry(float gridWorldSize, int resolution, Matrix world, IIntersectableObject obj)
{
var numCubes = new Point3(resolution, resolution, resolution);
var grid = new HermiteDataGrid();
var gridToWorld = Matrix.Scaling(1f / resolution, 1f / resolution, 1f / resolution) * Matrix.Scaling(new Vector3(gridWorldSize));
var gridToGeometry = gridToWorld * Matrix.Invert(world);
var geometryToGrid = Matrix.Invert(gridToGeometry);
// Fill vertices
grid.cells = new Array3D <Vertex>(numCubes + new Point3(1, 1, 1));
grid.ForEachGridPoint(cube =>
{
grid.cells[cube] = new Vertex()
{
Sign = obj.IsInside(Vector3.TransformCoordinate(cube.ToVector3(), gridToGeometry)),
EdgeData = new Vector4[3]
};
});
// Find changing edges and calculate edge info
grid.ForEachGridPoint(cube =>
{
var sign = grid.GetSign(cube);
for (int i = 0; i < grid.dirs.Length; i++)
{
Point3 start = cube;
Point3 end = cube + grid.dirs[i];
if (sign == grid.GetSign(end))
{
continue;
}
//sign difference
Vector3 startT = Vector3.TransformCoordinate(start, gridToGeometry);
Vector3 endT = Vector3.TransformCoordinate(end, gridToGeometry);
var vector4 = obj.GetIntersection(startT, endT);
var intersectionPoint = Vector3.TransformCoordinate(Vector3.Lerp(startT, endT, vector4.W), geometryToGrid);
var realLerp = Vector3.Distance(start, intersectionPoint); // /1
Debug.Assert(Math.Abs(Vector3.Distance(start, end) - 1) < 0.001); // Algo check
vector4 = new Vector4(Vector3.Normalize(Vector3.TransformNormal(vector4.TakeXYZ(), geometryToGrid)), realLerp);
grid.cells[cube].EdgeData[i] = vector4;
}
});
return(grid);
}
