void RenderCube()
{
IndexBuffer indexBuff;
VertexBuffer vertexBuff;
vertexBuff = new VertexBuffer ( device,
D3DX.GetFVFVertexSize ( UntransformedVertex.FVFFormat ) * 8,
Usage.None,
UntransformedVertex.FVFFormat,
Pool.Default );
indexBuff = new IndexBuffer ( device, sizeof(short) * 36, Usage.WriteOnly, Pool.Default, true );
DataStream dStream = vertexBuff.Lock ( 0, 0, LockFlags.None );
UntransformedVertex[] verts = new UntransformedVertex[8];
//front lower left corner
verts[0] = new UntransformedVertex ( new Vector3 ( 0, 0, 1f ), Color.Green.ToArgb () );
//front lower right corner
verts[1] = new UntransformedVertex ( new Vector3 ( 1f, 0f, 1f ), Color.Red.ToArgb () );
//front upper left corner
verts[2] = new UntransformedVertex ( new Vector3 ( 0f, 1f, 1f ), Color.Green.ToArgb () );
//front upper right corner
verts[3] = new UntransformedVertex ( new Vector3 ( 1f, 1f, 1f ), Color.Red.ToArgb () );
//back lower left corner
verts[4] = new UntransformedVertex ( new Vector3 ( 0f, 0f, 2f ), Color.Green.ToArgb () );
//back lower right corner
verts[5] = new UntransformedVertex ( new Vector3 ( 1f, 0f, 2f ), Color.Red.ToArgb () );
//back upper left corner
verts[6] = new UntransformedVertex ( new Vector3 ( 0f, 1f, 2f ), Color.Green.ToArgb () );
//back upper right corner
verts[7] = new UntransformedVertex ( new Vector3 ( 1f, 1f, 2f ), Color.Red.ToArgb () );
dStream.WriteRange ( verts );
vertexBuff.Unlock ();
dStream.Dispose ();
dStream = indexBuff.Lock ( 0, 0, LockFlags.None );
short[] indices = new short[36];
//front face
indices[0] = 0; indices[1] = 1; indices[2] = 2;
indices[3] = 3; indices[4] = 2; indices[5] = 1;
//left face
indices[6] = 4; indices[7] = 6; indices[8] = 0;
indices[9] = 7; indices[10] = 2; indices[11] = 0;
//bottom face
indices[12] = 4; indices[13] = 5; indices[14] = 1;
indices[15] = 0; indices[16] = 4; indices[17] = 5;
//right face
indices[18] = 1; indices[19] = 3; indices[20] = 7;
indices[21] = 5; indices[22] = 3; indices[23] = 7;
//top face
indices[24] = 6; indices[25] = 7; indices[26] = 3;
indices[27] = 2; indices[28] = 3; indices[29] = 6;
//back face
indices[30] = 6; indices[31] = 7; indices[32] = 4;
indices[33] = 5; indices[34] = 7; indices[35] = 4;
indexBuff.Unlock ();
dStream.Dispose ();
device.Indices = indexBuff;
device.SetStreamSource ( 0, this.vertBuffer, 0, D3DX.GetFVFVertexSize ( UntransformedVertex.FVFFormat ) );
//Exception thrown right here
device.DrawIndexedPrimitives ( PrimitiveType.TriangleList, 0, 0, 8, 0, 12 );
}
[SlimDX]Problem With Index Buffers [New Problem]
Author
I am really new to SlimDX and I am learning about indices/index buffers. My code below throws a InvalidCall exception when it runs. I could really use some help with this as I have no clue as to what is wrong:
Thanks,
jdub
[Edited by - jdub on December 22, 2008 1:19:22 AM]
in the indices lock part, you are not actually writing to the buffer... you are though at the vertex part.
DataStream dStream = vertexBuff.Lock ( 0, 0, LockFlags.None );
....
dStream.WriteRange ( verts );
vertexBuff.Unlock ();
but at the indices:
dStream = indexBuff.Lock ( 0, 0, LockFlags.None );
...
indexBuff.Unlock ();
so my guess is that there's something wrong?
DataStream dStream = vertexBuff.Lock ( 0, 0, LockFlags.None );
....
dStream.WriteRange ( verts );
vertexBuff.Unlock ();
but at the indices:
dStream = indexBuff.Lock ( 0, 0, LockFlags.None );
...
indexBuff.Unlock ();
so my guess is that there's something wrong?
Author
Thanks a ton guys! I feel really stupid because those were both very obvious errors. I fixed the exception and got the cube to render.
I still have a problem though. When I try to rotate the cube around the X axis, it rotates around fine. However, when I try to rotate it around the Y or Z axis, it won't render properly. Based on the amount of rotation, it either shows a thin sliver of the shape or doesn't draw at all.
I turned off culling to see if that might be a problem but still nothing
I went through the indices and vertices and checked to make sure that I had the right values and I could find nothing wrong.
It would be great if I could get some more help with this.
updated source:
Thanks again, jdub.
I still have a problem though. When I try to rotate the cube around the X axis, it rotates around fine. However, when I try to rotate it around the Y or Z axis, it won't render properly. Based on the amount of rotation, it either shows a thin sliver of the shape or doesn't draw at all.
I turned off culling to see if that might be a problem but still nothing
I went through the indices and vertices and checked to make sure that I had the right values and I could find nothing wrong.
It would be great if I could get some more help with this.
updated source:
void RenderCube() { IndexBuffer indexBuff; VertexBuffer vertexBuff; vertexBuff = new VertexBuffer ( device, D3DX.GetFVFVertexSize ( UntransformedVertex.FVFFormat ) * 8, Usage.WriteOnly, UntransformedVertex.FVFFormat, Pool.Default ); indexBuff = new IndexBuffer ( device, sizeof(short) * 36, Usage.WriteOnly, Pool.Default, true ); DataStream dStream = vertexBuff.Lock ( 0, 0, LockFlags.None ); UntransformedVertex[] verts = new UntransformedVertex[8]; camera.LookAt ( Vector3.Zero ); camera.Position = new Vector3 ( 5, 5, 5 ); //front lower right corner verts[0] = new UntransformedVertex ( new Vector3 ( 0.5f, 0f, 0f ), Color.Red.ToArgb () ); //front lower left corner verts[1] = new UntransformedVertex ( new Vector3 ( 0f, 0f, 0f ), Color.Green.ToArgb () ); //front upper left corner verts[2] = new UntransformedVertex ( new Vector3 ( 0f, 0.5f, 0f ), Color.Green.ToArgb () ); //front upper right corner verts[3] = new UntransformedVertex ( new Vector3 ( 0.5f, 0.5f, 0f ), Color.Red.ToArgb () ); //back lower left corner verts[4] = new UntransformedVertex ( new Vector3 ( 0f, 0f, 1f ), Color.Green.ToArgb () ); //back lower right corner verts[5] = new UntransformedVertex ( new Vector3 ( 0.5f, 0f, 1f ), Color.Red.ToArgb () ); //back upper left corner verts[6] = new UntransformedVertex ( new Vector3 ( 0f, 0.5f, 1f ), Color.Green.ToArgb () ); //back upper right corner verts[7] = new UntransformedVertex ( new Vector3 ( 0.5f, 0.5f, 1f ), Color.Red.ToArgb () ); dStream.WriteRange ( verts ); vertexBuff.Unlock (); dStream.Dispose (); dStream = indexBuff.Lock ( 0, 0, LockFlags.None ); short[] indices = new short[36]; //front face indices[0] = 1; indices[1] = 0; indices[2] = 2; indices[3] = 3; indices[4] = 2; indices[5] = 0; //left face indices[6] = 4; indices[7] = 6; indices[8] = 1; indices[9] = 6; indices[10] = 2; indices[11] = 1; //bottom face indices[12] = 4; indices[13] = 5; indices[14] = 0; indices[15] = 1; indices[16] = 4; indices[17] = 5; //right face indices[18] = 0; indices[19] = 3; indices[20] = 7; indices[21] = 5; indices[22] = 0; indices[23] = 7; //top face indices[24] = 6; indices[25] = 7; indices[26] = 3; indices[27] = 2; indices[28] = 3; indices[29] = 6; //back face indices[30] = 6; indices[31] = 7; indices[32] = 4; indices[33] = 5; indices[34] = 7; indices[35] = 4; dStream.WriteRange ( indices ); indexBuff.Unlock (); dStream.Dispose (); device.Indices = indexBuff; device.SetStreamSource ( 0, vertexBuff, 0, D3DX.GetFVFVertexSize ( UntransformedVertex.FVFFormat ) ); device.VertexFormat = UntransformedVertex.FVFFormat; device.SetRenderState ( RenderState.Lighting, false ); device.SetRenderState ( RenderState.CullMode, Cull.None ); Matrix mat = device.GetTransform ( TransformState.World ); mat *= Matrix.RotationY ( MathHelper.ToRadians ( 45 ) ); device.SetTransform ( TransformState.World, mat ); device.DrawIndexedPrimitives ( PrimitiveType.TriangleList, 0, 0, 8, 0, 12 ); }Thanks again, jdub.
Your method of using GetTransform each frame is rather unorthodox, and I'm not sure that it's guaranteed to work properly. The usual method would be to have a variable somewhere that holds the rotation, and then update it each frame. After it's updated, build a fresh rotation matrix from that angle.
Author
So I changed these lines:
Matrix mat = device.GetTransform ( TransformState.World );
mat *= Matrix.RotationY ( MathHelper.ToRadians ( 45 ) );
to:
Matrix mat;
mat = Matrix.RotationY ( MathHelper.ToRadians ( 45 ) );
device.SetTransform ( TransformState.World, mat );
It still produces the same results.
Matrix mat = device.GetTransform ( TransformState.World );
mat *= Matrix.RotationY ( MathHelper.ToRadians ( 45 ) );
to:
Matrix mat;
mat = Matrix.RotationY ( MathHelper.ToRadians ( 45 ) );
device.SetTransform ( TransformState.World, mat );
It still produces the same results.
This topic is closed to new replies.
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