Re: SetIndexBufferData
From: Michel Walsh (vanderghast_at_VirusAreFunnierThanSpam)
Date: 08/10/04
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Date: Tue, 10 Aug 2004 13:18:47 -0400
Hi,
Is your graphic card support int4 indexes? Have you tried with an array of
short rather than an array of integer? Have you tried to save the mesh in a
file (after having Clean it), and edit it into the mesh viewer tool? Have
your tried with PositionNormal (not textured) CustomVertex?
If int[] to short[] solves your problem, please, report it, so I will
abandon my own investigation (I try to do the same, but following the
example in the help file, but with just partial success, right now, ie, for
less than around 600 values in the index buffer).
Vanderghast, Access MVP
"Jason" <Jason@mobiform.com> wrote in message
news:%23NF0CUnfEHA.592@TK2MSFTNGP11.phx.gbl...
> I cant seem to get my cylinder generation code to work. I suspect it's the
> SetIndexBufferDataCall since the create (bool?) remains undefined and the
> buffersize remains 0. I must be missing something stupid simple. Perhaps
> someone can point it out.
>
> Jason
>
> //The C# following code will try to make a cylinder, tho its totally
> unconfirmed since I have yet to see its output
>
>
> int slices = (int)_slices.animVal;
> int stacks = (int)_stacks.animVal;
> int numFaces = ( slices * 2) + ( (stacks+1) * slices * 2);
> int numVertices = (( stacks + 2 ) * slices ) + 2;
>
>
> Microsoft.DirectX.Direct3D.Mesh mesh = new
> Microsoft.DirectX.Direct3D.Mesh( numFaces, numVertices, MeshFlags.Managed,
> CustomVertex.PositionNormalTextured.Format, device );
>
>
>
> float r1 = _r1.animVal.value;
> float r2 = _r2.animVal.value;
> float length = _length.animVal.value;
>
> CustomVertex.PositionNormalTextured[] verts;
>
> verts =
(CustomVertex.PositionNormalTextured[])mesh.VertexBuffer.Lock(0,
> typeof(CustomVertex.PositionNormalTextured), 0, numVertices);
>
> int []indices = new int[numFaces*3];
> int currentIndice = 0;
>
> float currentY = length/2.0f;
> float angleInc = SVGViewPlus.SVGDOM.SVG3D.Math.Constants.TWO_PI /
slices;
> float heightInc = length / (stacks+1);
>
> //middle center top
> verts[numVertices-2].X = 0.0f;
> verts[numVertices-2].Y = currentY;
> verts[numVertices-2].Z = 0.0f;
> verts[numVertices-2].Nx = 0.0f;
> verts[numVertices-2].Ny = 1.0f;
> verts[numVertices-2].Nz = 0.0f;
> verts[numVertices-2].Tu = 0.0f;
> verts[numVertices-2].Tv = 0.0f;
>
> //middle center bottom
> verts[numVertices-1].X = 0.0f;
> verts[numVertices-1].Y = -currentY;
> verts[numVertices-1].Z = 0.0f;
> verts[numVertices-1].Nx = 0.0f;
> verts[numVertices-1].Ny = -1.0f;
> verts[numVertices-1].Nz = 0.0f;
> verts[numVertices-1].Tu = 1.0f;
> verts[numVertices-1].Tv = 1.0f;
>
>
> Matrix33 tempMatrix = new Matrix33();
> SVGViewPlus.SVGDOM.SVG3D.Math.Vector3 vectorPoint = new
> SVGViewPlus.SVGDOM.SVG3D.Math.Vector3();
>
> for ( int i = 0; i < (stacks + 2); i++ )
> {
> float angle = 0.0f;
> float V = i / (stacks + 1);
> float radius = SVGViewPlus.SVGDOM.SVG3D.Math.Functions.Lerp( r1, 0,
r2,
> 1, V );
>
>
> for ( int j = 0; j < slices; j++ )
> {
> angle += angleInc;
>
> //build vertices
> tempMatrix.BuildIdentity();
> tempMatrix.BuildRotationY( angle );
>
> vectorPoint.X = 0.0f;
> vectorPoint.Y = currentY;
> vectorPoint.Z = radius;
>
> vectorPoint = SVGViewPlus.SVGDOM.SVG3D.Math.Vector3.TransformNormal(
> vectorPoint, tempMatrix );
>
> int index = (i*slices)+j;
>
> verts[index].X = vectorPoint.X;
> verts[index].Y = vectorPoint.Y;
> verts[index].Z = vectorPoint.Z;
>
> vectorPoint.Y = 0.0f;
> vectorPoint.Normalize();
>
> verts[index].Nx = vectorPoint.X;
> verts[index].Ny = vectorPoint.Y;
> verts[index].Nz = vectorPoint.Z;
>
> verts[index].Tu = angle /
> SVGViewPlus.SVGDOM.SVG3D.Math.Constants.TWO_PI;
> verts[index].Tv = V;
> //Build indicies
>
> if ( i == 0 )
> {//top cap
> indices[currentIndice++] = numVertices-2;
> indices[currentIndice++] = index;
> if ( (j+1) >= slices )
> {
> indices[currentIndice++] = i*slices;
> }
> else
> {
> indices[currentIndice++] = index+1;
> }
> }
> else if ( i == (stacks + 1) )
> {//bottom cap
> indices[currentIndice++] = numVertices-1;
> indices[currentIndice++] = index;
> if ( (j+1) >= slices )
> {
> indices[currentIndice++] = i*slices;
> }
> else
> {
> indices[currentIndice++] = index+1;
> }
> }
> else
> {
> //1 tri
> indices[currentIndice++] = index;
> if ( (j+1) >= slices )
> {
> indices[currentIndice++] = (i-1)*slices;
> }
> else
> {
> indices[currentIndice++] = ((i-1)*slices)+j+1;
> }
> indices[currentIndice++] = ((i-1)*slices)+j;
>
> //2 tri
> indices[currentIndice++] = index;
> indices[currentIndice++] = ((i-1)*slices)+j;
> if ( (j-1) < 0 )
> {
> indices[currentIndice++] = (i)*slices+j-1+slices;
> }
> else
> {
> indices[currentIndice++] = ((i-1)*slices)+j-1;
> }
> }
>
> }
>
> currentY -= heightInc;
> }
>
>
> mesh.SetIndexBufferData( indices, LockFlags.None );
>
> // mesh.IndexBuffer.SetData( indices, 0, LockFlags.None );
>
> // Mesh mesh = Microsoft.DirectX.Direct3D.Mesh.Cylinder(device,
> _r1.animVal.value, _r2.animVal.value, _length.animVal.value,
> (int)_slices.animVal, (int) _stacks.animVal);
> _mesh.D3DMesh = mesh.Clone(MeshFlags.Managed ,
> CustomVertex.PositionNormalTextured.Format, device);
> mesh.Dispose();
>
> // GenerateRandomTextureCoordinates();
>
>
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