Adding experimental Basic DAE exporter to OpenKh.Tools.KhModels, and some things

OpenKh.ColladaUtils/AlsoExtension.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OpenKh.ColladaUtils
+{
+    /// <seealso cref="https://kotlinlang.org/docs/scope-functions.html"/>
+    internal static class AlsoExtension
+    {
+        /// <seealso cref="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/also.html"/>
+        public static T Also<T>(this T obj, Action<T> action)
+        {
+            action(obj);
+            return obj;
+        }
+    }
+}

OpenKh.ColladaUtils/DaeModels.cs

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+using COLLADASchema;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Numerics;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OpenKh.ColladaUtils
+{
+    public static class DaeModels
+    {
+        public record DaeModel(
+            IReadOnlyList<DaeBone> Bones,
+            IReadOnlyList<DaeMaterial> Materials,
+            IReadOnlyList<DaeMesh> Meshes,
+            IReadOnlyList<DaeSkinController> SkinControllers,
+            IReadOnlyList<DaeMesh> InstanceGeometries,
+            IReadOnlyList<DaeInstanceController> InstanceControllers,
+            float GeometryScaling);
+
+        public record DaeInstanceController(
+            DaeMesh Mesh,
+            DaeBone Skeleton);
+
+        public record DaeSkinController(
+            DaeMesh Mesh,
+            IReadOnlyList<DaeBone> Bones,
+            IReadOnlyList<Matrix4x4> InvBindMatrices,
+            IReadOnlyList<float> SkinWeights,
+            IReadOnlyList<IReadOnlyList<DaeVertexWeight>> VertexWeightSets);
+
+        public record DaeVertexWeight(
+            int JointIndex,
+            int WeightIndex);
+
+        /// <param name="TriangleStripSets">
+        /// From blender 3.2.0:
+        /// 
+        /// ```
+        /// ERROR: Primitive type TRIANGLE_STRIPS is not supported.
+        /// Ignoring mesh Mesh1109
+        /// ```
+        /// </param>
+        public record DaeMesh(
+            string Name,
+            DaeMaterial? Material,
+            IReadOnlyList<Vector3> Vertices,
+            IReadOnlyList<Vector2> TextureCoordinates,
+            IReadOnlyList<IReadOnlyList<DaeVertexPointer>> TriangleStripSets,
+            IReadOnlyList<IReadOnlyList<DaeVertexPointer>> TriangleSets);
+
+        public record DaeVertexPointer(
+            int VertexIndex,
+            int TextureCoordinateIndex);
+
+        /// <param name="ParentIndex">`-1` for root</param>
+        public record DaeBone(
+            string Name,
+            int ParentIndex,
+            Vector3 RelativeScale,
+            Vector3 RelativeRotation,
+            Vector3 RelativeTranslation
+        );
+
+        public record DaeMaterial(
+            string Name,
+            string PngFilePath);
+    }
+}

OpenKh.ColladaUtils/OpenKh.ColladaUtils.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Update="collada_schema_1_4_1.xsd">
+      <SubType>Designer</SubType>
+    </None>
+  </ItemGroup>
+
+</Project>