public void UpdateAmbientOcclusionOld(Model model, Group occluders)
{
string mapName = "point_normals_for_ambient_occlusion";
GeometryMesh mesh = model.Batch.MeshSource as GeometryMesh;
if (mesh == null)
{
return;
}
Matrix4 pointFrame = new Matrix4();
Geometry geometry = mesh.Geometry;
var pointLocations = geometry.PointAttributes.Find <Vector3>("point_locations");
var polygonCentroids = geometry.PolygonAttributes.Find <Vector3>("polygon_centroids");
var pointNormals = geometry.PointAttributes.Find <Vector3>(mapName);
var cornerNormals = geometry.CornerAttributes.Contains <Vector3>("corner_normals") ? geometry.CornerAttributes.Find <Vector3>("corner_normals") : null;
var cornerColors = geometry.CornerAttributes.FindOrCreate <Vector4>("corner_colors");
cornerColors.Clear();
float[] colorBuffer = new float[mesh.GetMesh.VertexBufferRange.Count * 4];
foreach (Polygon polygon in geometry.Polygons)
{
foreach (Corner corner in polygon.Corners)
{
Point point = corner.Point;
Vector3 eye = Vector3.Mix(pointLocations[point], polygonCentroids[polygon], 0.01f);
Vector3 normal;
if (
(cornerNormals != null) &&
(cornerNormals.ContainsKey(corner) == true)
)
{
normal = cornerNormals[corner];
}
else
{
normal = pointNormals[point];
}
eye = model.Frame.LocalToWorld.Matrix.TransformPoint(eye);
normal = model.Frame.LocalToWorld.Matrix.TransformDirection(normal);
eye += normal * 0.01f;
//aoEye = eye;
//aoBack = normal;
Matrix4.CreateLookAt(eye, eye + normal, normal.MinAxis, out pointFrame);
Vector3 positionInWorld = pointFrame.TransformPoint(new Vector3(0.0f, 0.0f, 0.0f));
aoHemicubeRenderer.Render(pointFrame, occluders);
float occlusion = aoHemicubeRenderer.Average;
cornerColors[corner] = new Vector4(occlusion, occlusion, occlusion, 1.0f);
}
}
mesh.BuildMeshFromGeometry(BufferUsageHint.StaticDraw, NormalStyle.CornerNormals);
model.Name = "AmbientOcclusion(" + model.Name + ")";
}
//int sampleCount = 50;
//float distance = 4.0f;
public void UpdateAmbientOcclusion(Model model, Group occluders, string mapName)
{
#if false // \todo fix
GeometryMesh mesh = model.Batch.MeshSource as GeometryMesh;
if (mesh == null)
{
return;
}
Geometry geometry = mesh.Geometry;
model.UpdateOctree();
var shape = new TriangleMeshShape(model.Octree);
shape.SphericalExpansion = 0.0f;
#if VISUALIZE_RAYS
sceneManager.DebugLineRenderer.Begin();
#endif
var pointLocations = geometry.PointAttributes.Find <Vector3>("point_locations");
var polygonCentroids = geometry.PolygonAttributes.Find <Vector3>("polygon_centroids");
var pointNormals = geometry.PointAttributes.Find <Vector3>(mapName);
var cornerNormals = geometry.CornerAttributes.Contains <Vector3>("corner_normals") ? geometry.CornerAttributes.Find <Vector3>("corner_normals") : null;
var cornerColors = geometry.CornerAttributes.FindOrCreate <Vector4>("corner_colors");
cornerColors.Clear();
int badCount = 0;
foreach (Polygon polygon in geometry.Polygons)
{
foreach (Corner corner in polygon.Corners)
{
Point point = corner.Point;
// Start from corner position slightly moved towards polygon center
Vector3 initialEye = Vector3.Mix(pointLocations[point], polygonCentroids[polygon], 0.001f);
Vector3 normal;
if (
(cornerNormals != null) &&
(cornerNormals.ContainsKey(corner) == true)
)
{
normal = cornerNormals[corner];
}
else
{
normal = pointNormals[point];
}
JMatrix orientation = JMatrix.Identity;
JMatrix invOrientation = JMatrix.Identity;
Vector3 modelPosition = Vector3.Zero;
// Slightly up from surface
initialEye += normal * 0.01f;
int visibility = sampleCount;
JVector position = Conversions.JVector(modelPosition);
JVector direction;
JVector jnormal;
Vector3 eye = initialEye;
JVector origin = Conversions.JVector(eye);
// Sample a few directions
for (int c = 0; c < sampleCount; ++c)
{
// Get a random direction until it points up from the surface
Vector3 sampleDirection;
float dot;
do
{
sampleDirection = Random();
dot = Vector3.Dot(normal, sampleDirection);
}while(dot < 0.25f);
// Scale
direction = Conversions.JVector(sampleDirection * distance);
bool hit = false;
{
float tempFraction;
if (shape is Multishape)
{
Multishape ms = (shape as Multishape).RequestWorkingClone();
JVector tempNormal;
int msLength = ms.Prepare(ref origin, ref direction);
for (int i = 0; i < msLength; i++)
{
ms.SetCurrentShape(i);
if (
GJKCollide.Raycast(
ms, ref orientation, ref invOrientation, ref position,
ref origin, ref direction, out tempFraction, out tempNormal
)
)
{
hit = true;
break;
}
}
ms.ReturnWorkingClone();
}
else
{
hit = GJKCollide.Raycast(
shape, ref orientation, ref invOrientation, ref position,
ref origin, ref direction, out tempFraction, out jnormal
);
}
}
if (hit)
{
visibility -= 1;
}
Vector3 root = new Vector3(origin.X, origin.Y, origin.Z);
Vector3 tip = root + 0.02f * new Vector3(direction.X, direction.Y, direction.Z);
#if VISUALIZE_RAYS
sceneManager.DebugLineRenderer.Line(
root,
Vector4.Zero,
tip,
(hit ? Vector4.UnitX : Vector4.UnitY)
);
#endif
}
float visibilityFloat = (float)(visibility) / (float)(sampleCount);
cornerColors[corner] = new Vector4(visibilityFloat, visibilityFloat, visibilityFloat, 1.0f);
}
}
mesh.Geometry.ComputePolygonCentroids();
mesh.Geometry.ComputePolygonNormals();
mesh.Geometry.SmoothNormalize("corner_normals", "polygon_normals", (2.0f * (float)Math.PI));
mesh.Geometry.SmoothAverage("corner_colors", mapName);
mesh.BuildMeshFromGeometry(BufferUsageHint.StaticDraw, NormalStyle.CornerNormals);
//UpdateMeshCornerColors(mesh);
Debug.WriteLine("bad count = " + badCount.ToString());
#if VISUALIZE_RAYS
sceneManager.DebugLineRenderer.End();
sceneManager.DebugFrame = model.Frame;
#endif
//model.Name = "AmbientOcclusion(" + model.Name + ")";
#endif
}