Proper way of transforming 3D primitives in C#/XNA? -


i have block class contains array of 36 vertices, constructor builds block around origin (0, 0, 0), , method updating.

i'm using physics library manipulate blocks. assign body , collision skin block , update physics step every update. after every update matrix block's new position, orientation, etc.

now, can't wrap head around best way go applying matrix block , efficiently updating vertex buffer every frame.

this have @ moment, i'm positive there's better method...

class block {     const float fullblocksize = 20f;     const float halfblocksize = fullblocksize / 2;      public vertexpositionnormaltexture [] vertices = new vertexpositionnormaltexture[36];     public vertexpositionnormaltexture [] currentvertices = new vertexpositionnormaltexture[36];     public dynamicvertexbuffer vbuffer;      vector3 position;      public block(vector3 blockposition)     {         position = blockposition * fullblocksize;          /*          * build 6 faces of block here.          * block built around origin,          * (0, 0, 0) being center of block.         */          vbuffer = new dynamicvertexbuffer(game.device, vertexpositionnormaltexture.vertexdeclaration, vertices.length, bufferusage.writeonly);         vbuffer.setdata(vertices);     }     public matrix worldmatrix     {                 {             return matrix.createtranslation(position);         }     }     public void update()     {         currentvertices = (vertexpositionnormaltexture[])vertices.clone();         matrix currentworld = worldmatrix;         for(int = 0; < currentvertices.length; ++i)         {             currentvertices[i].position = vector3.transform(currentvertices[i].position, currentworld);         }         vbuffer.setdata(currentvertices);     } }

let shader it...one of parameters of shader worldmatrix...

to draw it:

effect.parameters["worldmatrix"].setvalue(world); effect.apply(0);

if have problems drawing block... try create world transform matrix , test it...

effect.parameters["worldmatrix"].setvalue(matrix.createrotationz(angle)); effect.apply(0);

if have several instances of block, can use instancing pass trasnform matrix in vertexbuffer shader...

here can find info instancing: http://blogs.msdn.com/b/shawnhar/archive/2010/06/17/drawinstancedprimitives-in-xna-game-studio-4-0.aspx


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