Projection matrixes, and stuff...

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Socoder -> On Topic -> Projection matrixes, and stuff...
Sun, 30 Oct 2011, 09:19
Afr0	I'm trying to figure out how to render Sims. And so far I'm able to render static meshes (although I've only tested with heads so far), but the problem is that I'm only able to render them sideways! I can't for the life of me figure out how to configure the world matrix such that the mesh is rendered upright! Here's my current code (which is based around a sample-project showing how to use XNA with Windows Forms): using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using XNA = Microsoft.Xna.Framework; using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; namespace XNAWinForms { /// <summary> /// Windows form that inherits from XNAWinForms and adds the rendering of a simple rotating triangle /// /// Author: Iñaki Ayucar (https://graphicdna.blogspot.com) /// Date: 14/11/2007 /// /// This software is distributed "for free" for any non-commercial usage. The software is provided “as-is.” /// You bear the risk of using it. The contributors give no express warranties, guarantees or conditions. /// </summary> public partial class Form1 : XNAWinForm { private Mesh m_CurrentMesh; private Texture2D m_Tex; bool m_LoadComplete = false; private float mRotation = 0f; private Matrix mViewMat, mWorldMat, mProjectionMat; private BasicEffect mSimpleEffect; VertexPositionColor[] triVerts = new VertexPositionColor[] { new VertexPositionColor(Vector3.Zero2, Microsoft.Xna.Framework.Graphics.Color.Blue), new VertexPositionColor(Vector3.Right2, Microsoft.Xna.Framework.Graphics.Color.Green), new VertexPositionColor(Vector3.Up2, Microsoft.Xna.Framework.Graphics.Color.Red)}; private VertexPositionNormalTexture[] m_NormVerticies; /// <summary> /// /// </summary> public Form1() { InitializeComponent(); this.DeviceResetting += new XNAWinForm.EmptyEventHandler(mWinForm_DeviceResetting); this.DeviceReset += new XNAWinForm.GraphicsDeviceDelegate(mWinForm_DeviceReset); this.OnFrameRender += new XNAWinForm.GraphicsDeviceDelegate(mWinForm_OnFrameRender); this.OnFrameMove += new GraphicsDeviceDelegate(Form1_OnFrameMove); mViewMat = mWorldMat = mProjectionMat = Matrix.Identity; } /// <summary> /// /// </summary> /// <param name="pDevice"></param> void Form1_OnFrameMove(Microsoft.Xna.Framework.Graphics.GraphicsDevice pDevice) { mRotation += 0.05f; this.mWorldMat = Matrix.CreateRotationY(mRotation); } /// <summary> /// /// </summary> /// <param name="pDevice"></param> void mWinForm_OnFrameRender(GraphicsDevice pDevice) { // Configure effect mSimpleEffect.World = this.mWorldMat; mSimpleEffect.View = this.mViewMat; mSimpleEffect.Projection = this.mProjectionMat; mSimpleEffect.DiffuseColor = XNA.Graphics.Color.DarkRed.ToVector3(); if (m_Tex != null) { mSimpleEffect.Texture = m_Tex; mSimpleEffect.TextureEnabled = true; mSimpleEffect.EnableDefaultLighting(); } mSimpleEffect.CommitChanges(); // Draw mSimpleEffect.Begin(); mSimpleEffect.Techniques[0].Passes[0].Begin(); /pDevice.DrawUserPrimitives<VertexPositionColor>(PrimitiveType.TriangleList, triVerts, 0, 1);/ if (m_NormVerticies != null) { if (m_LoadComplete) { foreach (Face Fce in m_CurrentMesh.Faces) { VertexPositionNormalTexture[] Vertex = new VertexPositionNormalTexture[3]; Vertex[0] = m_NormVerticies[Fce.AVertexIndex]; Vertex[1] = m_NormVerticies[Fce.BVertexIndex]; Vertex[2] = m_NormVerticies[Fce.CVertexIndex]; pDevice.DrawUserPrimitives<VertexPositionNormalTexture>(PrimitiveType.TriangleList, Vertex, 0, 1); } } } mSimpleEffect.Techniques[0].Passes[0].End(); mSimpleEffect.End(); } /// <summary> /// /// </summary> /// <param name="pDevice"></param> void mWinForm_DeviceReset(GraphicsDevice pDevice) { // Re-Create effect mSimpleEffect = new BasicEffect(pDevice, null); // Configure device pDevice.VertexDeclaration = new VertexDeclaration(pDevice, VertexPositionColor.VertexElements); pDevice.RenderState.CullMode = CullMode.None; // Create camera and projection matrix mWorldMat = Matrix.Identity; mViewMat = Matrix.CreateLookAt(Vector3.Backward 10,Vector3.Zero, Vector3.Up); mProjectionMat = Matrix.CreatePerspectiveFieldOfView(MathHelper.Pi / 4.0f, (float)pDevice.PresentationParameters.BackBufferWidth / (float)pDevice.PresentationParameters.BackBufferHeight, 1.0f, 100.0f); } /// <summary> /// /// </summary> void mWinForm_DeviceResetting() { // Dispose all if (mSimpleEffect != null) mSimpleEffect.Dispose(); } private void openToolStripMenuItem_Click(object sender, EventArgs e) { OpenFileDialog OpenFDiag = new OpenFileDialog(); OpenFDiag.Filter = "Mesh file\|.mesh"; OpenFDiag.Title = "Select a mesh to open..."; if (OpenFDiag.ShowDialog() == DialogResult.OK) { m_CurrentMesh = new Mesh(OpenFDiag.FileName); m_NormVerticies = new VertexPositionNormalTexture[m_CurrentMesh.VertexCount]; for (int i = 0; i < m_CurrentMesh.VertexCount; i++) { m_NormVerticies[i] = new VertexPositionNormalTexture(); m_NormVerticies[i].Position.X = m_CurrentMesh.VertexData[i, 0]; m_NormVerticies[i].Position.Y = m_CurrentMesh.VertexData[i, 1]; m_NormVerticies[i].Position.Z = m_CurrentMesh.VertexData[i, 2]; m_NormVerticies[i].Normal.X = m_CurrentMesh.VertexData[i, 3]; m_NormVerticies[i].Normal.Y = m_CurrentMesh.VertexData[i, 4]; m_NormVerticies[i].Normal.Z = m_CurrentMesh.VertexData[i, 5]; //Not really sure why this is important, but I think it has something to do //with being able to see the texture. m_NormVerticies[i].Normal.Normalize(); } for (int i = 0; i < m_CurrentMesh.TexVertexCount; i++) { m_NormVerticies[i].TextureCoordinate.X = m_CurrentMesh.TextureVertData[i, 0]; m_NormVerticies[i].TextureCoordinate.X = m_CurrentMesh.TextureVertData[i, 1]; } string TextureName = OpenFDiag.FileName.Replace("meshes", "textures").Replace("mesh", "jpg"). Replace("fah", "").Replace("fa", "falgt").Replace("-head-head", ""); m_Tex = Texture2D.FromFile(this.Device, TextureName); m_LoadComplete = true; } } private void exitToolStripMenuItem_Click(object sender, EventArgs e) { Application.Exit(); } } } --v Also...* if anyone has any idea why the texture isn't showing up, even though I'm calling EnableDefaultLighting(), please do tell! Here's an image of the rendering in action (though it is hard to tell that it is rendered correctly without seeing it swivel around its y-axis); -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Tue, 01 Nov 2011, 06:50
Afr0	Ok so I looked over the code again and realized I had made a mistake: for (int i = 0; i < m_CurrentMesh.TexVertexCount; i++) { m_NormVerticies[i].TextureCoordinate.X = m_CurrentMesh.TextureVertData[i, 1]; m_NormVerticies[i].TextureCoordinate.X = m_CurrentMesh.TextureVertData[i, 2]; } --v I changed it to: for (int i = 0; i < m_CurrentMesh.TexVertexCount; i++) { m_NormVerticies[i].TextureCoordinate.X = m_CurrentMesh.TextureVertData[i, 1]; m_NormVerticies[i].TextureCoordinate.Y = m_CurrentMesh.TextureVertData[i, 2]; } --v Then I added three lines in the main drawing loop: if (m_NormVerticies != null) { if (m_LoadComplete) { foreach (Face Fce in m_CurrentMesh.Faces) { VertexPositionNormalTexture[] Vertex = new VertexPositionNormalTexture[3]; Vertex[0] = m_NormVerticies[Fce.AVertexIndex]; Vertex[1] = m_NormVerticies[Fce.BVertexIndex]; Vertex[2] = m_NormVerticies[Fce.CVertexIndex]; Vertex[0].TextureCoordinate = m_NormVerticies[Fce.AVertexIndex].TextureCoordinate; Vertex[1].TextureCoordinate = m_NormVerticies[Fce.BVertexIndex].TextureCoordinate; Vertex[2].TextureCoordinate = m_NormVerticies[Fce.CVertexIndex].TextureCoordinate; pDevice.DrawUserPrimitives<VertexPositionNormalTexture>(PrimitiveType.TriangleList, Vertex, 0, 1); } } } --v The texture still isn't showing up though! Please help! -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Tue, 08 Nov 2011, 05:47
Afr0	Getting there! I think the remaining bits are a combination of XNA not liking *.jpg textures and me not having any clue what to do with the blenddata in the meshes. -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Mon, 14 Nov 2011, 07:04
Afr0	In a desperate attempt to understand what I'm doing, can someone please explain wtf this function does (aside from renormalizing the target's normal)? /// <summary> /// This is an important function. I have no idea what it does, but it helps /// render body meshes correctly. This function was ported from SimPose 8. /// </summary> /// <param name="TransformedVector1">The first transformed vector.</param> /// <param name="TransformedVector2">The second transformed vector.</param> /// <param name="Target">The target vector.</param> /// <param name="Weight">The weight (last quaternion in a bone's array of quaternions).</param> public void Blend(Vector3 TransformedVector1, Vector3 TransformedVector2, ref VertexPositionNormalTexture Target, float Weight) { float FloatingPointDelta = 0.000001f; float Weight1 = 1.0f - Weight; Target.Position.X = Weight * TransformedVector1.X + Weight1 * Target.Position.X; Target.Position.Y = Weight * TransformedVector1.Y + Weight1 * Target.Position.Y; Target.Position.Z = Weight * TransformedVector1.Z + Weight1 * Target.Position.Z; //Normalize the target's normal. double Length = Math.Sqrt((Target.Normal.X * Target.Normal.X) + (Target.Normal.Y * Target.Normal.Y) + (Target.Normal.Z * Target.Normal.Z)); double Factor = (Math.Abs(Length) > FloatingPointDelta) ? Length : 1.0f; Target.Normal.X /= (float)Factor; Target.Normal.Y /= (float)Factor; Target.Normal.Z /= (float)Factor; } --v -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Tue, 15 Nov 2011, 13:54
Afr0	Progress - heads can now be loaded and displayed fully textured. Turns out I was using the ThumbnailID to load the textures, giving me the thumbnail as opposed to the actual texture. -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Tue, 15 Nov 2011, 13:56
Jayenkai	Did you figure out what the function did?
Tue, 15 Nov 2011, 14:53
Afr0	Unfortunately, no. It's only important for rendering body meshes, and even with the function the body meshes are still deformed. As I wrote on the frontpage chat last night, I've put body rendering on the backburner to protect myself from ending up in a mental asylum. -=-=- Afr0 Games Project Dollhouse on Github - Please fork!