Further mesh conversion research: animation frames are now converted into blend shape animations, which can be played back either with or without smoothing.

Assets/Scripts/Data/QExtensions.cs

@@ -24,4 +24,10 @@ public static class QExtensions
     {
         return new Vector3(vec.x, vec.y, vec.z);
     }
+
+    public static Vector3 ToVector3(this QTriVertex triVertex)
+    {
+        byte[] v = triVertex.v;
+        return new Vector3(v[0] / 255f, v[1] / 255f, v[2] / 255f);
+    }
 }

Assets/Scripts/Modules/AliasModelAnimator.cs

@@ -0,0 +1,33 @@
+using System.Collections;
+using UnityEngine;
+
+public class AliasModelAnimator : MonoBehaviour
+{
+    //private int frameNumber = 0;
+    private float frameNumber = 0;
+
+    IEnumerator Start()
+    {
+        var meshRenderer = GetComponent<SkinnedMeshRenderer>();
+        if (!meshRenderer)
+        {
+            Destroy(this);
+            yield break;
+        }
+
+        var mesh = meshRenderer.sharedMesh;
+        int numFrames = mesh.GetBlendShapeFrameCount(0);
+
+        while (true)
+        {
+            float blendWeight = (float)frameNumber / numFrames;
+            meshRenderer.SetBlendShapeWeight(0, blendWeight);
+
+            //yield return new WaitForSeconds(0.1f); // Animate at 10 fps
+            yield return null;
+
+            //frameNumber = (frameNumber + 1) % numFrames;
+            frameNumber = (frameNumber + Time.deltaTime * 10) % numFrames;
+        }
+    }
+}

Assets/Scripts/Modules/AliasModelAnimator.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 7ff59a2f3571489c92ba4dc81d3df990
+timeCreated: 1618590871

Assets/Scripts/Modules/RenderModule.cs

@@ -1,4 +1,5 @@
 using UnityEngine;
+using UnityEngine.Rendering;
 
 public partial class RenderModule
 {
@@ -17,43 +18,64 @@ public partial class RenderModule
     {
         Debug.Log($"Alias model '{name}' with {header.numVerts} vertices, {header.numTriangles} triangles, {header.numFrames} frame(s)");
 
-        // TODO: convert Quake poses into Mesh blend shapes with AddBlendShapeFrame
-
-        ConvertVertices(poseVertices[0], boundsMin.ToVector3(), boundsMax.ToVector3(), out var vertices, out var normals);
+        ConvertVertices(header, poseVertices[0], out var vertices, out var normals);
         ConvertTriangles(triangles, out var indices);
         ConvertUVs(stVertices, header.skinWidth, header.skinHeight, out var uvs);
         
         var mesh = new Mesh { name = name };
         mesh.SetVertices(vertices);
         mesh.SetNormals(normals);
-        mesh.SetIndices(indices, MeshTopology.Triangles, 0);
+        mesh.SetIndices(indices, MeshTopology.Triangles, 0, false);
         mesh.SetUVs(0, uvs);
+        
+        CreateBlendShapes(mesh, vertices, normals, header, poseVertices);
+        
         mesh.Optimize();    // This ensures that triangles will be properly fused and organized in the best possible way
+        mesh.RecalculateBounds();
         mesh.UploadMeshData(true);
 
         var go = new GameObject(System.IO.Path.GetFileNameWithoutExtension(name));
         go.transform.SetPositionAndRotation(new Vector3(xPos, 0, 0), Quaternion.Euler(-90, 90, 0));
-        go.transform.localScale = Vector3.one * 0.01f;
-        var mf = go.AddComponent<MeshFilter>();
-        mf.sharedMesh = mesh;
-        var mr = go.AddComponent<MeshRenderer>();
-        mr.material = new Material(Shader.Find("Universal Render Pipeline/Simple Lit"));
         
-        xPos += 1f;
+        if (header.numFrames > 1)
+        {
+            var mr = go.AddComponent<SkinnedMeshRenderer>();
+            mr.material = new Material(Shader.Find("Universal Render Pipeline/Simple Lit"));
+            mr.sharedMesh = mesh;
+            mr.shadowCastingMode = ShadowCastingMode.Off;
+            mr.receiveShadows = false;
+            mr.lightProbeUsage = LightProbeUsage.Off;
+            mr.reflectionProbeUsage = ReflectionProbeUsage.Off;
+            go.AddComponent<AliasModelAnimator>();
+        }
+        else
+        {
+            var mf = go.AddComponent<MeshFilter>();
+            mf.sharedMesh = mesh;
+            var mr = go.AddComponent<MeshRenderer>();
+            mr.material = new Material(Shader.Find("Universal Render Pipeline/Simple Lit"));
+            mr.shadowCastingMode = ShadowCastingMode.Off;
+            mr.receiveShadows = false;
+            mr.lightProbeUsage = LightProbeUsage.Off;
+            mr.reflectionProbeUsage = ReflectionProbeUsage.Off;
+        }
+
+        xPos += 0.5f;
         return 1;
     }
 
-    private static void ConvertVertices(QTriVertex[] triVerts, Vector3 boundsMin, Vector3 boundsMax, out Vector3[] vertices, out Vector3[] normals)
+    private static void ConvertVertices(QAliasHeader header, QTriVertex[] triVerts, out Vector3[] vertices, out Vector3[] normals)
     {
         int numVerts = triVerts.Length;
         vertices = new Vector3[numVerts];
         normals = new Vector3[numVerts];
 
+        Vector3 scale = header.scale.ToVector3();
+        Vector3 origin = header.scaleOrigin.ToVector3();
+        
         for (int i = 0; i < numVerts; ++i)
         {
-            byte[] v = triVerts[i].v;
-            Vector3 vec = new Vector3(v[0] / 255f, v[1] / 255f, v[2] / 255f);
-            vertices[i] = boundsMin + Vector3.Scale(boundsMax - boundsMin, vec);
+            vertices[i] = Vector3.Scale(triVerts[i].ToVector3(), scale);
             normals[i] = QLightNormals.Get(triVerts[i].lightNormalIndex);
         }
     }
@@ -86,4 +108,30 @@ public partial class RenderModule
             uvs[i] = Vector2.Scale(new Vector2(stVerts[i].s, skinHeight - stVerts[i].t), scale);
         }
     }
+
+    private static void CreateBlendShapes(
+        Mesh mesh, Vector3[] baseVertices, Vector3[] baseNormals,
+        QAliasHeader header, QTriVertex[][] poseVertices)
+    {
+        var deltaVertices = new Vector3[header.numVerts];
+        var deltaNormals = new Vector3[header.numVerts];
+        
+        Vector3 scale = header.scale.ToVector3();
+        Vector3 origin = header.scaleOrigin.ToVector3();
+        
+        // Frame 0 is the base pose, so we start with frame 1
+        for (int frameIdx = 1; frameIdx < header.numFrames; ++frameIdx)
+        {
+            var poseVerts = poseVertices[frameIdx];
+            
+            for (int vertIdx = 0; vertIdx < header.numVerts; ++vertIdx)
+            {
+                Vector3 vert = Vector3.Scale(poseVerts[vertIdx].ToVector3(), scale);
+                deltaVertices[vertIdx] = vert - baseVertices[vertIdx];
+                deltaNormals[vertIdx] = QLightNormals.Get(poseVerts[vertIdx].lightNormalIndex) - baseNormals[vertIdx];
+            }
+            
+            mesh.AddBlendShapeFrame(mesh.name, (float)frameIdx / (header.numFrames-1), deltaVertices, deltaNormals, null);
+        }
+    }
 }