Problems with rendering *.skn meshes

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Socoder -> C/C++/C#/Other -> Problems with rendering *.skn meshes
Sun, 12 Aug 2007, 17:21
Afr0	Ok, so I'm trying to render .skn meshes from The Sims. Currently I'm using C# to do this, and I have some basic loading code up and running. The problem is that when trying to render, everything winds up looking completely garbled (unfortunately). After searching around the net for a bit, I wound up finding a link where the original creator of the format, Don Hopkins, explains how to render meshes described by the format (linky). There, he mentions that one has to 'first transform all the vertices[vertexCount] to world coordinates according to the boneBindings, into transformedVertices[vertexCount]'. Now, I can hardly claim to be an expert at 3D graphics, and I've been trying to figure out how to transform vertices into world coordinates for a while now, without much luck. Any ideas? Anyways, here's my current loading code that loads a .skn file and attempts to create a Mesh instance out of it (the Mesh class is from DirectX): using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Windows.Forms; using Microsoft.DirectX; using Microsoft.DirectX.Direct3D; namespace SimLoader.Skn { public class Skn : BinaryReader { #region Private Variables Device m_Device; private string m_FileName; private string m_TextureName; private int m_BoneCount; private List<string> m_Bones; private int m_FaceCount; private List<Face> m_Faces; private MemoryStream m_IndexBuffer; private int m_BoneBindingCount; private List<BoneBinding> m_BoneBindings; private int m_TexturePointCount; private List<TexturePoint> m_TexturePoints; private int m_BlendingWeightCount; private List<BlendingInfo> m_BlendingWeights; private int m_VertexCount; private CustomVertex.PositionOnly[] m_VertexBuffer; private Mesh m_Mesh; #endregion public Skn(string FilePath, Device Devc) : base(File.Open(FilePath, FileMode.Open)) { m_Device = Devc; m_FileName = ReadDOSString(); m_TextureName = ReadDOSString(); m_BoneCount = int.Parse(ReadDOSString()); m_Bones = new List<string>(); for (int i = 0; i < m_BoneCount; i++) { String TmpBone = ReadDOSString(); m_Bones.Add(TmpBone); } m_FaceCount = int.Parse(ReadDOSString()); m_Faces = new List<Face>(); m_IndexBuffer = new MemoryStream(); BinaryWriter Writer = new BinaryWriter(m_IndexBuffer); for (int i = 0; i < m_FaceCount; i++) { Face TmpFace = new Face(); TmpFace.ProcessData(ReadDOSString()); m_Faces.Add(TmpFace); } foreach (Face TmpFace in m_Faces) { Writer.Write(TmpFace.VertexIndex1); Writer.Write(TmpFace.VertexIndex2); Writer.Write(TmpFace.VertexIndex3); } m_BoneBindingCount = int.Parse(ReadDOSString()); m_BoneBindings = new List<BoneBinding>(); for (int i = 0; i < m_BoneBindingCount; i++) { BoneBinding TmpBoneBinding = new BoneBinding(); TmpBoneBinding.ProcessData(ReadDOSString()); m_BoneBindings.Add(TmpBoneBinding); } m_TexturePointCount = int.Parse(ReadDOSString()); m_TexturePoints = new List<TexturePoint>(); for (int i = 0; i < m_TexturePointCount; i++) { TexturePoint TmpTexturePoint = new TexturePoint(); TmpTexturePoint.ProcessData(ReadDOSString()); m_TexturePoints.Add(TmpTexturePoint); } m_BlendingWeightCount = int.Parse(ReadDOSString()); m_BlendingWeights = new List<BlendingInfo>(); for (int i = 0; i < m_BlendingWeightCount; i++) { BlendingInfo TmpBlendingInfo = new BlendingInfo(); TmpBlendingInfo.ProcessData(ReadDOSString()); m_BlendingWeights.Add(TmpBlendingInfo); } m_VertexCount = int.Parse(ReadDOSString()); m_VertexBuffer = new CustomVertex.PositionOnly[m_VertexCount]; for (int i = 0; i < m_VertexCount; i++) { Vertex TmpVertex = new Vertex(); TmpVertex.ProcessData(ReadDOSString()); m_VertexBuffer[i] = new CustomVertex.PositionOnly(TmpVertex.X, TmpVertex.Y, TmpVertex.Z); } CreateMesh(Devc, MeshFlags.Managed); } /// <summary> /// Creates a new instance of a Mesh class /// based on the loaded data. /// </summary> private void CreateMesh(Device Devc, MeshFlags Flags) { m_Mesh = new Mesh(m_FaceCount * 3, m_VertexCount * 6, Flags, VertexFormats.Position, Devc); try { m_Mesh.SetVertexBufferData(m_VertexBuffer, LockFlags.None); m_Mesh.SetIndexBufferData(m_IndexBuffer.ToArray(), LockFlags.None); int[] Adjacency = new int[m_Mesh.NumberFaces * 3]; m_Mesh.GenerateAdjacency(0.01F, Adjacency); m_Mesh.OptimizeInPlace(MeshFlags.OptimizeVertexCache, Adjacency); //m_Mesh.ComputeNormals(); } catch (DirectXException E) { m_Mesh.Dispose(); m_Mesh = null; throw E; } } private string ReadDOSString() { char TmpChar = new char(); string ReturnString = ""; while (true) { if (TmpChar == '\n') break; TmpChar = ReadChar(); if(TmpChar != '\n' && TmpChar != '\r') ReturnString = ReturnString + TmpChar; } return ReturnString; } #region Accessors /// <summary> /// The name of this .skn file. /// </summary> public string FileName { get { return m_FileName; } } /// <summary> /// The name of the texture referenced in this .skn file. /// </summary> public string TextureName { get { return m_TextureName; } } /// <summary> /// Number of bone references available in the loaded .skn file. /// </summary> public int BoneCount { get { return m_BoneCount; } } /// <summary> /// A list of all the bone references available in this .skn file. /// </summary> public List<string> Bones { get { return m_Bones; } } /// <summary> /// Number of Face instances available. /// </summary> public int FaceCount { get { return m_FaceCount; } } /// <summary> /// Number of BoneBinding instances available. /// </summary> public int BoneBindingCount { get { return m_BoneBindingCount; } } /// <summary> /// Number of TexturePoint instances available. /// </summary> public int TexturePointCount { get { return m_TexturePointCount; } } /// <summary> /// Number of BlendingWeight instances available. /// </summary> public int BlendingWeightCount { get { return m_BlendingWeightCount; } } /// <summary> /// Number of Vertex instances available. /// </summary> public int VertexCounts { get { return m_VertexCount; } } /// <summary> /// The generated mesh for this *.skn file. /// </summary> public Mesh SknMesh { get { return m_Mesh; } } #endregion } } --v If anyone has any hints and/or tips, I'd appreciate it! As a matter of facr, if people'd be up for it, I'd be willing to post this in the Campfire section just for fun (and learning, of course). Thanks in advance -=-=- Afr0 Games Project Dollhouse on Github - Please fork!