XNA-3D-plot cubes

I. Highlights

DrawCubeThe method of drawing a body (or other 3D image) is similar to that of drawing a triangle. The outline of a 3D image consists of a series of triangles. to reduce data redundancy, use

Graphicsdevice. drawindexedprimitives () method, instead of the graphicsdevice. drawuserprimitives () method used to draw a triangle ().

II. Implementation Code

1. Add member variables for the game class:

 
1: vertexpositioncolor [] vertexlist;
 
 
2: vertexbuffer;
 
 
3:Ushort[] Indexlist;
 
4: indexbuffer;
 
 
2. Define the coordinates of the six vertices of the cube in the loadcontent () method.
 
 
1: vertexlist =NewVertexpositioncolor []
 
 
2 :{
 
 
3:NewVertexpositioncolor (NewVector3 (1f, 1f,-1f), color. Red ),
 
4:NewVertexpositioncolor (NewVector3 (1f,-1f,-1f), color. Red ),
 
 
5:NewVertexpositioncolor (NewVector3 (-1f,-1f,-1f), color. Red ),
 
 
6:NewVertexpositioncolor (NewVector3 (-1f, 1f,-1f), color. Red ),
 
7:NewVertexpositioncolor (NewVector3 (1f, 1f, 1f), color. Red ),
 
 
8:NewVertexpositioncolor (NewVector3 (1f,-1f, 1f), color. Red ),
 
 
9:NewVertexpositioncolor (NewVector3 (-1f,-1f, 1f), color. Red ),
 
10:NewVertexpositioncolor (NewVector3 (-1f, 1f, 1f), color. Red)
 
 
11 :};
 
 
12: vertexbuffer =NewVertexbuffer (
 
 
13: graphicsdevice,
 
14:Typeof(Vertexpositioncolor ),
 
 
15: vertexlist. length,
 
 
16: bufferusage. None );
 
 
17: vertexbuffer. setdata <vertexpositioncolor> (vertexlist );
 
 
3. Define the vertex index array:
 
1: indexlist = new ushort []
 
 
2 :{
 
 
3,
 
 
4: 7, 4, 5, 7, 5, 6,
 
 
5,
 
6,
 
 
7,
 
 
8: 2, 1, 5, 2, 5, 6
 
 
9 :};
 
 
10: indexbuffer = new indexbuffer (
 
11: graphicsdevice,
 
 
12: typeof (ushort ),
 
 
13: indexlist. length,
 
 
14: bufferusage. None );
 
 
15: indexbuffer. setdata <ushort> (indexlist );
 
 
4. Add the drawing code in the draw () method:
 
1: graphicsdevice. setvertexbuffer (vertexbuffer );
 
 
2: graphicsdevice. Indices = indexbuffer;
 
 
3:
 
 
4:IntPrimitivecount = indexlist. Length/3;
 
5:Foreach(VAR passInBasiceffect. currenttechnique. Passes)
 
 
6 :{
 
 
7: Pass. Apply ();
 
 
8: graphicsdevice. drawindexedprimitives (
 
9: primitivetype. trianglelist,
 
 
10: 0,
 
 
11: 0,
 
 
12: vertexlist. length,
 
 
13: 0,
 
14: primitivecount );
 
 
15 :}