Merge branch 'master' of https://github.com/vpenades/SharpGLTF

tests/SharpGLTF.ThirdParty.Tests/CesiumInstancingTests.cs

@@ -0,0 +1,41 @@
+using NUnit.Framework;
+using SharpGLTF.Scenes;
+using SharpGLTF.Schema2;
+using SharpGLTF.Transforms;
+using System.Collections.Generic;
+using System.Linq;
+using System.Numerics;
+using System.Text.Json.Nodes;
+
+namespace SharpGLTF.ThirdParty
+{
+    public class CesiumTests
+    {
+        [Test]
+        [ResourcePathFormat("*\\Assets")]
+        public void WriteInstancedGlbWithFeatureIds()
+        {
+            var settings = SceneBuilderSchema2Settings.WithGpuInstancing;
+            settings.GpuMeshInstancingMinCount = 0;
+
+            var modelRoot = ModelRoot.Load(ResourceInfo.From("tree.glb"));
+            var meshBuilder = modelRoot.LogicalMeshes.First().ToMeshBuilder();
+            var sceneBuilder = new SceneBuilder();
+            var quaternion = Quaternion.CreateFromYawPitchRoll(0, 0, 0);
+            var scale = Vector3.One;
+
+            sceneBuilder.
+                    AddRigidMesh(meshBuilder, new AffineTransform(scale, quaternion, new Vector3(-10, 0, 10))).
+                    WithExtras(JsonNode.Parse("{\"_FEATURE_ID_0\":0}"));
+            sceneBuilder.
+                    AddRigidMesh(meshBuilder, new AffineTransform(scale, quaternion, new Vector3(0, 0, 0))).
+                    WithExtras(JsonNode.Parse("{\"_FEATURE_ID_0\":1}"));
+
+            var instancedModel = sceneBuilder.ToGltf2(settings);
+
+            var dstPath = AttachmentInfo
+                .From("instanced_model_with_feature_id.glb")
+                .WriteObject(f => instancedModel.SaveGLB(f));
+        }
+    }
+}