public static void PointInstancerTest()
{
var scene = USD.NET.Scene.Create();
var stageWeakRef = new pxr.UsdStageWeakPtr(scene.Stage);
var pi = new PointInstancerSample();
var cube = new CubeSample();
pi.prototypes.targetPaths = new string[] { "/Instancer/Cube" };
// Three instances, all prototype index zero.
pi.protoIndices = new int[3];
pi.positions = new UnityEngine.Vector3[3];
pi.positions[0] = new UnityEngine.Vector3(-2.5f, 0, 0);
pi.positions[1] = new UnityEngine.Vector3(0, 0, 0);
pi.positions[2] = new UnityEngine.Vector3(2.5f, 0, 0);
scene.Write("/Instancer", pi);
scene.Write("/Instancer/Cube", cube);
scene.Stage.Export("D:\\instancer-high-level.usda");
var piSample = new PointInstancerSample();
scene.Read("/Instancer", piSample);
var matrices = piSample.ComputeInstanceMatrices(scene, "/Instancer");
Console.WriteLine(String.Join(",", matrices.Select(p => p.ToString()).ToArray()));
Console.WriteLine(String.Join(",", piSample.prototypes.targetPaths.Select(p => p.ToString()).ToArray()));
Console.WriteLine(String.Join(",", piSample.protoIndices.Select(p => p.ToString()).ToArray()));
}
public static void CreatePointInstancerManualTest()
{
var scene = USD.NET.Scene.Create();
var stageWeakRef = new pxr.UsdStageWeakPtr(scene.Stage);
var pi = pxr.UsdGeomPointInstancer.Define(stageWeakRef, new pxr.SdfPath("/Instancer"));
var cube = pxr.UsdGeomCube.Define(stageWeakRef, new pxr.SdfPath("/Instancer/Cube"));
// The cube is the only prototype.
pi.CreatePrototypesRel().AddTarget(cube.GetPath());
// Create three instances of the cube (proto index=0).
var intArray = new pxr.VtIntArray(3, 0);
pi.CreateProtoIndicesAttr().Set(intArray);
var mesh = new pxr.UsdGeomMesh();
var meshSamples = new USD.NET.Unity.MeshSample[0];
// Create three positions.
var vec3fArray = new pxr.VtVec3fArray(3);
vec3fArray[0] = new pxr.GfVec3f(-2.5f, 0, 0);
vec3fArray[1] = new pxr.GfVec3f(0, 0, 0);
vec3fArray[2] = new pxr.GfVec3f(2.5f, 0, 0);
pi.CreatePositionsAttr().Set(vec3fArray);
scene.Stage.Export("D:\\instancer.usda");
//
// Compute the root transform for each instance.
//
var xforms = new pxr.VtMatrix4dArray(3);
pi.ComputeInstanceTransformsAtTime(xforms, time: 1.0, baseTime: 0.0);
for (int i = 0; i < xforms.size(); i++)
{
Console.WriteLine(xforms[i]);
}
}
