3D calculation - BlitzCoder.net

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Socoder -> On Topic -> 3D calculation
Tue, 28 Jul 2009, 14:10
Afr0	Is there a specific calculation for making a quad of a given size (I.E Height = 50, Width = 50) of vertices? I'm trying desperately to put together a GUI in DirectX using textured quads, and I'm not being very successful. I could use XNA, and it's very tempting, but I kinda want to try to learn how to do things in DirectX. Here's some of my current code: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Drawing; using Microsoft.DirectX; using Microsoft.DirectX.Direct3D; namespace SimsRenderPluginD.GUI { public class Window { private Vector3 m_XYZ; private Vector2 m_WidthHeight; private VertexBuffer m_VertexBuf; private CustomVertex.PositionColored[] m_Verts = new CustomVertex.PositionColored[4]; private Texture m_Tex; private Device m_Devc; public Window(Device Devc, float X, float Y, float Z, int Width, int Height, string TexPath) { m_WidthHeight = new Vector2((float)Width, (float)Height); m_XYZ = new Vector3(X, Y, Z); m_Devc = Devc; m_VertexBuf = new VertexBuffer(typeof(CustomVertex.PositionColored), 4, Devc, 0, CustomVertex.PositionColored.Format, Pool.Default); m_Verts[0].Position = new Vector3(X, 0, Z); m_Verts[0].Color = Color.White.ToArgb(); m_Verts[1].Position = new Vector3(X, Y, Z); m_Verts[1].Color = Color.White.ToArgb(); m_Verts[2].Position = new Vector3(0, Y, Z); m_Verts[2].Color = Color.White.ToArgb(); m_Verts[3].Position = new Vector3(0, 0, Z); m_Verts[3].Color = Color.White.ToArgb(); m_VertexBuf.SetData(m_Verts, 0, LockFlags.None); m_Tex = Texture.FromBitmap(Devc, (Bitmap)Bitmap.FromFile(TexPath), 0, Pool.Managed); } public void Draw() { //m_Devc.SetTexture(0, m_Tex); m_Devc.SetStreamSource(0, m_VertexBuf, 0); m_Devc.VertexFormat = CustomVertex.PositionColored.Format; m_Devc.DrawPrimitives(PrimitiveType.TriangleFan, 0, 2); } } } --v using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.IO; using System.Windows.Forms; using SimsRenderPluginD; using SimsRenderPluginD.GUI; using Microsoft.DirectX; using Microsoft.DirectX.Direct3D; namespace RenderTest { public partial class Form1 : Form { private Device m_Devc; private Mesh m_Mesh; private ExtendedMaterial[] m_MeshMaterials; private Window m_Wnd; public Form1() { InitializeComponent(); PresentParameters PresentParams = new PresentParameters(); PresentParams.Windowed = true; PresentParams.SwapEffect = SwapEffect.Discard; m_Devc = new Device(0, DeviceType.Hardware, this.Handle, CreateFlags.HardwareVertexProcessing, PresentParams); m_Wnd = new Window(m_Devc, 50, -50, 0.5f, 50, 50, "window_background.png"); /SimsMesh SMesh = SimsMesh.FromFile("b029faskn_teen\\xskin-b029faskn_teen-PELVIS-BODY.skn"); m_Mesh = Mesh.FromStream(SMesh.ToXFile("xskin-b029faskn_teen-PELVIS-BODY"), MeshFlags.IbManaged, m_Devc, out m_MeshMaterials);/ } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); if (m_Devc == null) return; Matrix QuadMatrix = new Matrix(); QuadMatrix = Matrix.Identity; m_Devc.Clear(ClearFlags.Target, Color.Blue, 1.0f, 0); m_Devc.BeginScene(); QuadMatrix.Translate(-0.32f, 0.32f, 0f); m_Devc.SetTransform(TransformType.World, QuadMatrix); m_Wnd.Draw(); m_Devc.EndScene(); m_Devc.Present(); } } } --v Right now I can draw the quad pretty much anywhere in 3D space, but the size seems to vary randomly based on where I draw it. I need a specific way to determine the size! Also, what are U,V coordinates and how do I use them to apply a texture to my quad? -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Tue, 28 Jul 2009, 14:16
Phoenix	First off, no to MDX. It is old, buggy and unsupported. This no is even more reinforced when there is SlimDX, which is an excellent and more complete version of DirectX for .NET than MDX ever was. I'm not sure how those X/Y/Width/Height parameters relate to quads when they're passed to the Window constructor, but I'm guessing that you're after this instead: m_Verts[0].Position = new Vector3(X, Y, Z); m_Verts[0].Color = Color.White.ToArgb(); m_Verts[1].Position = new Vector3(X+Width, Y, Z); m_Verts[1].Color = Color.White.ToArgb(); m_Verts[2].Position = new Vector3(X+Width, Y+Height, Z); m_Verts[2].Color = Color.White.ToArgb(); m_Verts[3].Position = new Vector3(X, Y+Height, Z); m_Verts[3].Color = Color.White.ToArgb(); --v
Tue, 28 Jul 2009, 15:14
Afr0	Nope, didn't work. Any other suggestions??
Tue, 28 Jul 2009, 17:32
JL235	If all you want to use this for is to build a hardware accelerated GUI for an application then you might want to take a look at WPF (Windows Presentation Foundation). It's a .NET subsystem for creating GUIs that are rendered with DirectX rather then GDI. i.e. what you are trying to build above.