public void PolygonHitTests()
{
SolidMaterial redStuff = new SolidMaterial(new RGBA_Floats(1, 0, 0), 0, 0, 2);
{
TriangleShape facingPositiveX = new TriangleShape(new Vector3(0, 1, -1), new Vector3(0, 0, 1), new Vector3(0, -1, -1), redStuff);
IntersectInfo positiveXInfo = facingPositiveX.GetClosestIntersection(new Ray(new Vector3(1, 0, 0), new Vector3(-1, 0, 0)));
Assert.IsTrue(positiveXInfo.hitPosition == new Vector3(0, 0, 0));
Assert.IsTrue(positiveXInfo.hitType == IntersectionType.FrontFace);
Assert.IsTrue(positiveXInfo.closestHitObject == facingPositiveX);
Assert.IsTrue(positiveXInfo.distanceToHit == 1);
IntersectInfo negativeXInfo = facingPositiveX.GetClosestIntersection(new Ray(new Vector3(-1, 0, 0), new Vector3(1, 0, 0)));
Assert.IsTrue(negativeXInfo == null);
}
{
TriangleShape facingNegativeX = new TriangleShape(new Vector3(0, -1, -1), new Vector3(0, 0, 1), new Vector3(0, 1, -1), redStuff);
IntersectInfo positiveXInfo = facingNegativeX.GetClosestIntersection(new Ray(new Vector3(1, 0, 0), new Vector3(-1, 0, 0)));
Assert.IsTrue(positiveXInfo == null);
IntersectInfo negativeXInfo = facingNegativeX.GetClosestIntersection(new Ray(new Vector3(-1, 0, 0), new Vector3(1, 0, 0)));
Assert.IsTrue(negativeXInfo.hitPosition == new Vector3(0, 0, 0));
Assert.IsTrue(negativeXInfo.hitType == IntersectionType.FrontFace);
Assert.IsTrue(negativeXInfo.closestHitObject == facingNegativeX);
Assert.IsTrue(negativeXInfo.distanceToHit == 1);
}
}
public void TriangleMajorAxis()
{
var triangle0 = new TriangleShape(
new Vector3(-47.06726, 16.94526, 1.143421),
new Vector3(-30.66048, 39.52726, 1.143422),
new Vector3(-45.91038, 19.8672, 1.143422),
null);
Assert.AreEqual(2, triangle0.MajorAxis);
var triangle1 = new TriangleShape(
new Vector3(0, 1, 0),
new Vector3(0, 0, 1),
new Vector3(0, 0, 0),
null);
Assert.AreEqual(0, triangle1.MajorAxis);
var triangle2 = new TriangleShape(
new Vector3(1, 0, 0),
new Vector3(0, 0, 1),
new Vector3(0, 0, 0),
null);
Assert.AreEqual(1, triangle2.MajorAxis);
}
public void PolygonHitTests()
{
SolidMaterial redStuff = new SolidMaterial(new RGBA_Floats(1, 0, 0), 0, 0, 2);
{
TriangleShape facingPositiveX = new TriangleShape(new Vector3(0, 1, -1), new Vector3(0, 0, 1), new Vector3(0, -1, -1), redStuff);
IntersectInfo positiveXInfo = facingPositiveX.GetClosestIntersection(new Ray(new Vector3(1, 0, 0), new Vector3(-1, 0, 0)));
Assert.IsTrue(positiveXInfo.hitPosition == new Vector3(0, 0, 0));
Assert.IsTrue(positiveXInfo.hitType == IntersectionType.FrontFace);
Assert.IsTrue(positiveXInfo.closestHitObject == facingPositiveX);
Assert.IsTrue(positiveXInfo.distanceToHit == 1);
IntersectInfo negativeXInfo = facingPositiveX.GetClosestIntersection(new Ray(new Vector3(-1, 0, 0), new Vector3(1, 0, 0)));
Assert.IsTrue(negativeXInfo == null);
}
{
TriangleShape facingNegativeX = new TriangleShape(new Vector3(0, -1, -1), new Vector3(0, 0, 1), new Vector3(0, 1, -1), redStuff);
IntersectInfo positiveXInfo = facingNegativeX.GetClosestIntersection(new Ray(new Vector3(1, 0, 0), new Vector3(-1, 0, 0)));
Assert.IsTrue(positiveXInfo == null);
IntersectInfo negativeXInfo = facingNegativeX.GetClosestIntersection(new Ray(new Vector3(-1, 0, 0), new Vector3(1, 0, 0)));
Assert.IsTrue(negativeXInfo.hitPosition == new Vector3(0, 0, 0));
Assert.IsTrue(negativeXInfo.hitType == IntersectionType.FrontFace);
Assert.IsTrue(negativeXInfo.closestHitObject == facingNegativeX);
Assert.IsTrue(negativeXInfo.distanceToHit == 1);
}
}
public void EnumerateBvh()
{
// create a bvh hierarchy
var level4_a = new TriangleShape(new Vector3(0, 0, 1), new Vector3(0, 0, 3), new Vector3(0, 1, 2), null);
var level4_b = new TriangleShape(new Vector3(0, 0, 11), new Vector3(0, 0, 13), new Vector3(0, 1, 12), null);
var level4_c = new TriangleShape(new Vector3(3, 0, 1), new Vector3(3, 0, 3), new Vector3(3, 1, 2), null);
var level3_a = new UnboundCollection(new List <ITraceable>()
{
level4_a, level4_b, level4_c
});
var level3_b = new TriangleShape(new Vector3(43, 0, 1), new Vector3(43, 0, 3), new Vector3(43, 1, 2), null);
var level2_a = new Transform(level3_a, Matrix4X4.CreateTranslation(0, 0, 40));
var level2_b = new Transform(level3_b, Matrix4X4.CreateTranslation(0, 40, 0));
var level1 = new UnboundCollection(new List <ITraceable>()
{
level2_a, level2_b
});
var root = new Transform(level1);
// enumerate it and check it
Assert.AreEqual(9, new BvhIterator(root).Count());
int count = 0;
foreach (var item in new BvhIterator(root))
{
switch (count++)
{
case 0:
Assert.IsTrue(item.Bvh is Transform);
Assert.AreEqual(0, item.Depth);
Assert.AreEqual(Matrix4X4.CreateTranslation(0, 0, 0), item.TransformToWorld);
break;
case 1:
Assert.IsTrue(item.Bvh is UnboundCollection);
Assert.AreEqual(1, item.Depth);
Assert.AreEqual(Matrix4X4.CreateTranslation(0, 0, 0), item.TransformToWorld);
break;
case 2:
Assert.IsTrue(item.Bvh is Transform);
Assert.AreEqual(2, item.Depth);
Assert.AreEqual(Matrix4X4.CreateTranslation(0, 0, 0), item.TransformToWorld);
break;
case 3:
Assert.IsTrue(item.Bvh is UnboundCollection);
Assert.AreEqual(3, item.Depth);
Assert.AreEqual(Matrix4X4.CreateTranslation(0, 0, 40), item.TransformToWorld);
break;
case 4:
Assert.IsTrue(item.Bvh is TriangleShape);
Assert.AreEqual(4, item.Depth);
Assert.AreEqual(Matrix4X4.CreateTranslation(0, 0, 40), item.TransformToWorld);
break;
case 5:
Assert.IsTrue(item.Bvh is TriangleShape);
Assert.AreEqual(4, item.Depth);
Assert.AreEqual(Matrix4X4.CreateTranslation(0, 0, 40), item.TransformToWorld);
break;
case 6:
Assert.IsTrue(item.Bvh is TriangleShape);
Assert.AreEqual(4, item.Depth);
Assert.AreEqual(Matrix4X4.CreateTranslation(0, 0, 40), item.TransformToWorld);
break;
case 7:
Assert.IsTrue(item.Bvh is Transform);
Assert.AreEqual(2, item.Depth);
Assert.AreEqual(Matrix4X4.CreateTranslation(0, 0, 0), item.TransformToWorld);
break;
case 8:
Assert.IsTrue(item.Bvh is TriangleShape);
Assert.AreEqual(3, item.Depth);
Assert.AreEqual(Matrix4X4.CreateTranslation(0, 40, 0), item.TransformToWorld);
break;
}
}
}
public static void CreateITraceableForMesh(List<PlatingMeshData> perMeshInfo, List<Mesh> meshes, int i)
{
if (meshes[i] != null)
{
List<IRayTraceable> allPolys = new List<IRayTraceable>();
List<Vector3> positions = new List<Vector3>();
foreach (Face face in meshes[i].Faces)
{
positions.Clear();
foreach (Vertex vertex in face.Vertices())
{
positions.Add(vertex.Position);
}
// We should use the teselator for this if it is greater than 3.
Vector3 next = positions[1];
for (int positionIndex = 2; positionIndex < positions.Count; positionIndex++)
{
TriangleShape triangel = new TriangleShape(positions[0], next, positions[positionIndex], null);
allPolys.Add(triangel);
next = positions[positionIndex];
}
}
perMeshInfo[i].traceableData = BoundingVolumeHierarchy.CreateNewHierachy(allPolys);
}
}
private void CalculateIntersectCostsAndSaveToFile()
{
int numInterations = 5000000;
AxisAlignedBoundingBox referenceCostObject = new AxisAlignedBoundingBox(new Vector3(-.5, -.5, -.5), new Vector3(.5, .5, .5));
Stopwatch timer = new Stopwatch();
Vector3 accumulation = new Vector3();
timer.Start();
for (int i = 0; i < numInterations; i++)
{
accumulation += GetRandomIntersectingRay().directionNormal;
}
long notIntersectStuff = timer.ElapsedMilliseconds;
timer.Restart();
for (int i = 0; i < numInterations; i++)
{
GetRandomIntersectingRay().Intersection(referenceCostObject);
}
long referenceMiliseconds = timer.ElapsedMilliseconds;
SolidMaterial material = new SolidMaterial(RGBA_Floats.Black, 0, 0, 1);
long sphereMiliseconds = CalculateIntersectCostsForItem(new SphereShape(new Vector3(), .5, material), numInterations);
long cylinderMiliseconds = CalculateIntersectCostsForItem(new CylinderShape(.5, 1, material), numInterations);
long boxMiliseconds = CalculateIntersectCostsForItem(new BoxShape(new Vector3(-.5, -.5, -.5), new Vector3(.5, .5, .5), material), numInterations);
long planeMiliseconds = CalculateIntersectCostsForItem(new PlaneShape(new Vector3(0, 0, 1), 0, material), numInterations);
BaseShape triangleTest = new TriangleShape(new Vector3(-1, 0, 0), new Vector3(0, 1, 0), new Vector3(0, 0, 0), material);
long triangleMiliseconds = CalculateIntersectCostsForItem(triangleTest, numInterations);
System.IO.File.WriteAllText("Cost Of Primitive.txt",
"Cost of Primitives"
+ "\r\n" + numInterations.ToString("N0") + " intersections per primitive."
+ "\r\nTest Overhead: " + notIntersectStuff.ToString()
+ GetStringForFile("AABB", referenceMiliseconds, notIntersectStuff)
+ GetStringForFile("Sphere", sphereMiliseconds, notIntersectStuff)
+ GetStringForFile("Cylider", cylinderMiliseconds, notIntersectStuff)
+ GetStringForFile("Box", boxMiliseconds, notIntersectStuff)
+ GetStringForFile("Plane", planeMiliseconds, notIntersectStuff)
+ GetStringForFile("Triangle", triangleMiliseconds, notIntersectStuff)
);
}
private static List<IPrimitive> AddTraceDataForMesh(Mesh mesh, int totalActionCount, ref int currentAction, ref bool needToUpdateProgressReport, ReportProgressRatio reportProgress)
{
bool continueProcessing;
List<IPrimitive> allPolys = new List<IPrimitive>();
List<Vector3> positions = new List<Vector3>();
foreach (Face face in mesh.Faces)
{
positions.Clear();
foreach (Vertex vertex in face.Vertices())
{
positions.Add(vertex.Position);
}
// We should use the teselator for this if it is greater than 3.
Vector3 next = positions[1];
for (int positionIndex = 2; positionIndex < positions.Count; positionIndex++)
{
TriangleShape triangel = new TriangleShape(positions[0], next, positions[positionIndex], null);
allPolys.Add(triangel);
next = positions[positionIndex];
}
if (reportProgress != null)
{
if ((currentAction % 256) == 0 || needToUpdateProgressReport)
{
reportProgress(currentAction / (double)totalActionCount, "Creating Trace Polygons", out continueProcessing);
needToUpdateProgressReport = false;
}
currentAction++;
}
}
return allPolys;
}