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BobSong
2025-11-10 00:08:26 +08:00
parent 4059c207c0
commit 76f80db694
2814 changed files with 436400 additions and 178 deletions
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187
Assets/Obi/Scripts/Common/DataStructures/ASDF/ASDF.cs Normal file
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using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
namespace Obi
{
public class ASDF
{
static readonly Vector4[] corners =
{
new Vector4(-1,-1,-1,-1),
new Vector4(-1,-1,1,-1),
new Vector4(-1,1,-1,-1),
new Vector4(-1,1,1,-1),
new Vector4(1,-1,-1,-1),
new Vector4(1,-1,1,-1),
new Vector4(1,1,-1,-1),
new Vector4(1,1,1,-1)
};
static readonly Vector4[] samples =
{
new Vector4(0,0,0,0),
new Vector4(1,0,0,0),
new Vector4(-1,0,0,0),
new Vector4(0,1,0,0),
new Vector4(0,-1,0,0),
new Vector4(0,0,1,0),
new Vector4(0,0,-1,0),
new Vector4(0,-1,-1,0),
new Vector4(0,-1,1,0),
new Vector4(0,1,-1,0),
new Vector4(0,1,1,0),
new Vector4(-1,0,-1,0),
new Vector4(-1,0,1,0),
new Vector4(1,0,-1,0),
new Vector4(1,0,1,0),
new Vector4(-1,-1,0,0),
new Vector4(-1,1,0,0),
new Vector4(1,-1,0,0),
new Vector4(1,1,0,0)
};
const float sqrt3 = 1.73205f;
public static IEnumerator Build(float maxError, int maxDepth, Vector3[] vertexPositions, int[] triangleIndices, List<DFNode> nodes, int yieldAfterNodeCount = 32)
{
// Empty vertex or triangle lists, return.
if (maxDepth <= 0 ||
nodes == null ||
vertexPositions == null || vertexPositions.Length == 0 ||
triangleIndices == null || triangleIndices.Length == 0)
yield break;
// Build a bounding interval hierarchy from the triangles, to speed up distance queries:
IBounded[] t = new IBounded[triangleIndices.Length / 3];
for (int i = 0; i < t.Length; ++i)
{
int t1 = triangleIndices[i * 3];
int t2 = triangleIndices[i * 3 + 1];
int t3 = triangleIndices[i * 3 + 2];
t[i] = new Triangle(t1, t2, t3, vertexPositions[t1], vertexPositions[t2], vertexPositions[t3]);
}
var bih = BIH.Build(ref t);
// Copy reordered triangles over to a new array:
Triangle[] tris = Array.ConvertAll(t, x => (Triangle)x);
// Build angle weighted normals, used to determine the sign of the distance field.
Vector3[] angleNormals = ObiUtils.CalculateAngleWeightedNormals(vertexPositions,triangleIndices);
// Calculate bounding box of the mesh:
Bounds bounds = new Bounds(vertexPositions[0], Vector3.zero);
for (int i = 1; i < vertexPositions.Length; ++i)
bounds.Encapsulate(vertexPositions[i]);
bounds.Expand(0.2f);
// Auxiliar variables to keep track of current tree depth:
int depth = 0;
int nodesToNextLevel = 1;
// Initialize node list:
Vector4 center = bounds.center;
Vector3 boundsExtents = bounds.extents;
center[3] = Mathf.Max(boundsExtents[0], Math.Max(boundsExtents[1], boundsExtents[2]));
nodes.Clear();
nodes.Add(new DFNode(center));
var queue = new Queue<int>();
queue.Enqueue(0);
int processedNodeCount = 0;
while (queue.Count > 0)
{
// get current node:
int index = queue.Dequeue();
var node = nodes[index];
// measure distance at the 8 node corners:
for (int i = 0; i < 8; ++i)
{
Vector4 point = node.center + corners[i] * node.center[3];
point[3] = 0;
float distance = BIH.DistanceToSurface(bih, tris, vertexPositions,angleNormals,point);
if (i < 4)
node.distancesA[i] = distance;
else
node.distancesB[i - 4] = distance;
}
// only subdivide those nodes intersecting the surface:
if (depth < maxDepth && Mathf.Abs(BIH.DistanceToSurface(bih, tris, vertexPositions, angleNormals, node.center)) < node.center[3] * sqrt3)
{
// calculate mean squared error between measured distances and interpolated ones:
float mse = 0;
for (int i = 0; i < samples.Length; ++i)
{
Vector4 point = node.center + samples[i] * node.center[3];
float groundTruth = BIH.DistanceToSurface(bih, tris, vertexPositions, angleNormals, point);
float estimation = node.Sample(point);
float d = groundTruth - estimation;
mse += d * d;
}
mse /= (float)samples.Length;
// if error > threshold, subdivide the node:
if (mse > maxError)
{
node.firstChild = nodes.Count;
for (int i = 0; i < 8; ++i)
{
queue.Enqueue(nodes.Count);
nodes.Add(new DFNode(node.center + corners[i] * node.center[3] * 0.5f));
}
}
// keep track of current depth:
if (--nodesToNextLevel == 0)
{
depth++;
nodesToNextLevel = queue.Count;
}
}
// feed the modified node back:
nodes[index] = node;
// if we've processed enough nodes, yield.
if (nodes.Count - processedNodeCount >= yieldAfterNodeCount)
{
processedNodeCount = nodes.Count;
yield return null;
}
}
}
public static float Sample(List<DFNode> nodes, Vector3 position)
{
if (nodes != null && nodes.Count > 0)
{
var queue = new Queue<int>();
queue.Enqueue(0);
while (queue.Count > 0)
{
// get current node:
var node = nodes[queue.Dequeue()];
if (node.firstChild > -1)
queue.Enqueue(node.firstChild + node.GetOctant(position));
else
return node.Sample(position);
}
}
return 0;
}
}
}

11
Assets/Obi/Scripts/Common/DataStructures/ASDF/ASDF.cs.meta Normal file
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fileFormatVersion: 2
guid: 6951f2457b77d4daf9f257e128b6dfb2
MonoImporter:
externalObjects: {}
serializedVersion: 2
defaultReferences: []
executionOrder: 0
icon: {instanceID: 0}
userData:
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66
Assets/Obi/Scripts/Common/DataStructures/ASDF/DFNode.cs Normal file
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using System;
using UnityEngine;
namespace Obi
{
[Serializable]
public struct DFNode
{
public Vector4 distancesA;
public Vector4 distancesB;
public Vector4 center;
public int firstChild;
// add 12 bytes of padding to ensure correct memory alignment:
#pragma warning disable 0414
private int pad0;
private int pad1;
private int pad2;
#pragma warning restore 0414
public DFNode(Vector4 center)
{
this.distancesA = Vector4.zero;
this.distancesB = Vector4.zero;
this.center = center;
this.firstChild = -1;
this.pad0 = 0;
this.pad1 = 0;
this.pad2 = 0;
}
public float Sample(Vector3 position)
{
Vector3 nPos = GetNormalizedPos(position);
// trilinear interpolation: interpolate along x axis
Vector4 x = distancesA + (distancesB - distancesA) * nPos[0];
// interpolate along y axis
float y0 = x[0] + (x[2] - x[0]) * nPos[1];
float y1 = x[1] + (x[3] - x[1]) * nPos[1];
// interpolate along z axis.
return y0 + (y1 - y0) * nPos[2];
}
public Vector3 GetNormalizedPos(Vector3 position)
{
float size = center[3] * 2;
return new Vector3(
(position[0] - (center[0] - center[3])) / size,
(position[1] - (center[1] - center[3])) / size,
(position[2] - (center[2] - center[3])) / size
);
}
public int GetOctant(Vector3 position)
{
int index = 0;
if (position[0] > center[0]) index |= 4;
if (position[1] > center[1]) index |= 2;
if (position[2] > center[2]) index |= 1;
return index;
}
}
}

11
Assets/Obi/Scripts/Common/DataStructures/ASDF/DFNode.cs.meta Normal file
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guid: 769e6e9ced39347bc96146f1858ab648
MonoImporter:
externalObjects: {}
serializedVersion: 2
defaultReferences: []
executionOrder: 0
icon: {instanceID: 0}
userData:
assetBundleName:
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