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custom effect drawing

分類： XNA Article

2012/05/18 22:30

custom effect兩個方法都可以，後者比較簡潔

//method1

   myEffect.Parameters["World"].SetValue(myWorld);
   myEffect.Parameters["View"].SetValue(myView);
   myEffect.Parameters["Projection"].SetValue(myProjection);

   foreach (ModelMesh mesh in myModell.Meshes)
   {
    foreach (ModelMeshPart meshPart in mesh.MeshParts)
    {
     graphics.GraphicsDevice.Indices = meshPart.IndexBuffer;
     graphics.GraphicsDevice.SetVertexBuffer(meshPart.VertexBuffer);

     foreach (EffectPass currentPass in myEffect.CurrentTechnique.Passes)
     {
      currentPass.Apply();
      graphics.GraphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, meshPart.NumVertices, meshPart.StartIndex, meshPart.PrimitiveCount);
     }
    }
   }

//method2

myEffect.Parameters["World"].SetValue(myWorld);
myEffect.Parameters["View"].SetValue(myView);
myEffect.Parameters["Projection"].SetValue(myProjection);

   foreach (ModelMesh mesh in myModell.Meshes)
   {
    foreach (ModelMeshPart part in mesh.MeshParts)
    {
     part.Effect = myEffect;
    }
    mesh.Draw();
   }

reference: custom effect with mesh Draw

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Painter11 筆刷弄亂了，回復不了

分類：美術

2012/04/24 00:03

20120424

右上角的筆刷可以設定回來

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今天下班到天瓏書局買了三本書

分類：日記

2012/04/23 23:03

iOS SDK 開發範例大全 (The iOS 5 Developer's Cookbook Core Concepts and Essential Recipes for iOS Programmers, 3-e)

精通 Objective-C 程式設計, 4-e (Programming in Objective-C, 4-e)

百變CG 電繪職人技

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VertexPositionColor vertex, vertex color problem

分類： XNA skills

2012/04/21 21:26

I want to draw a quad with red color, but xna always show the white quad. Does somebody know how to solve this problem?

1	VertexPositionColor[] hpVertex;
2	VertexBuffer hpVertexBuffer;
3	BasicEffect hpBasicEffect;
4
5	Init
6	hpBasicEffect = new BasicEffect(device);
7
8	float hpHeight = 0.20f;
9	float hpWidth = 1.0f;
10
11	hpVertex = new VertexPositionColor[4];
12
13	hpVertex[0] = new VertexPositionColor(new Vector3(0.0f, hpHeight, 0.0f), Color.Red);
14	hpVertex[1] = new VertexPositionColor(new Vector3(hpWidth, hpHeight, 0.0f), Color.Red);
15	hpVertex[2] = new VertexPositionColor(new Vector3(0.0f, 0.0f, 0.0f), Color.Red);
16	hpVertex[3] = new VertexPositionColor(new Vector3(hpWidth, 0.0f, 0.0f), Color.Red);
17
18	hpVertexBuffer = new VertexBuffer(device, VertexPositionColor.VertexDeclaration, 4, BufferUsage.WriteOnly);
19	hpVertexBuffer.SetData (hpVertex, 0, hpVertex.Length);
20
21	Draw
22
23	hpBasicEffect.World = Matrix.Identity;
24	hpBasicEffect.View = camera.view;
25	hpBasicEffect.Projection = camera.projection;
26
27	foreach (EffectPass currentPass in hpBasicEffect.CurrentTechnique.Passes)
28	{
29	currentPass.Apply();
30
31	device.SetVertexBuffer(hpVertexBuffer);
32	device.DrawPrimitives(PrimitiveType.TriangleStrip, 0, 2);
33	}

try adding this in Init

hpBasicEffect.VertexColorEnabled = true;

and if you still get white, make sure the lighting is off

hpBasicEffect.LightingEnabled = false;

Thanks! My problem is solved. But I have another problem.
If I enable lighting, like hpBasicEffect.LightingEnabled = true; , and then XNA will crash at Line 10 and appears the error message as below:

The current vertex declaration does not include all the elements required by the current vertex shader.

Does somebody meet the situation and solve it?

1	foreach (EffectPass currentPass in hpBasicEffect.CurrentTechnique.Passes)
2	{
3	currentPass.Apply();
4
5	device.SetVertexBuffer(hpVertexBuffer);
6	device.DrawPrimitives(PrimitiveType.TriangleStrip, 0, 2);
7
8	}
9
10	spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend);