public static void RebuildMeshObjectBuffers()
{
if (!NeedRebuilding)
{
return;
}
RayTracingMaster.Rerender();
_meshObjects.Clear();
_vertices.Clear();
_normals.Clear();
_indices.Clear();
foreach (var obj in _rayTracingObjects)
{
int firstVertex = _vertices.Count;
UnityEngine.Mesh mesh = obj.GetComponent <MeshFilter>().mesh;
_vertices.AddRange(mesh.vertices);
_normals.AddRange(mesh.normals);
//注意当前模型的第一个顶点并不是所有模型中的第一个顶点
int firstIndex = _indices.Count;
var indices = mesh.GetIndices(0);
_indices.AddRange(indices.Select(index => index + firstVertex));
_meshObjects.Add(new Mesh()
{
localToWorldMatrix = obj.transform.localToWorldMatrix,
localNormalToWorldMatrix = obj.transform.localToWorldMatrix.inverse.transpose,
indices_offset = firstIndex,
indices_count = indices.Length
});
}
NeedRebuilding = false;
}
public static void SetRandomSpheres(uint SpheresMax, Vector3 SphereRadius, float SpherePlacementRadius)
{
RayTracingMaster.Rerender();
for (int i = 0; i < SpheresMax; i++)
{
Sphere sphere = new Sphere();
sphere.radius = SphereRadius.x + Random.value * (SphereRadius.y - SphereRadius.x);
//由单位圆内随机映射为所给半径圆内随机
Vector2 randomPos = Random.insideUnitCircle * SpherePlacementRadius;
//与y=0平面相切
sphere.position = new Vector3(randomPos.x, sphere.radius, randomPos.y);
//判断是否与已生成球重合
bool isInOther = false;
foreach (Sphere other in spheres)
{
float minDist = sphere.radius + other.radius;
if (Vector3.SqrMagnitude(sphere.position - other.position) < minDist * minDist)
{
isInOther = true;
}
}
if (isInOther)
{
continue;
}
//一半几率生成漫反射，一半几率生成镜面反射
Color color = Random.ColorHSV();
bool metal = Random.value < 0.5f;
sphere.albedo = metal ? Vector3.zero : new Vector3(color.r, color.g, color.b);
sphere.specular = metal ? new Vector3(color.r, color.g, color.b) : Vector3.one * 0.04f;
Color emissioncolor = Random.ColorHSV();
sphere.emission = (Random.value > 0.85) ?
new Vector3(emissioncolor.r, emissioncolor.g, emissioncolor.b) * Random.Range(3, 40)
: Vector3.zero;
sphere.smoothness = Random.Range(0.7f, 1.0f);
sphere.smoothness = SmoothnessToPhongAlpha(sphere.smoothness);
spheres.Add(sphere);
}
}
