Code behaves differently on 3 different computers. ?

What graphics cards do the three PCs have ?

Let me try to add a little more detail to this problem description. The primitives that do not draw (on the machine that draws some and not others) all seem to be calls drawIndexedPrimitives. The calls to drawPrimitives all draw fine.
I'm wondering if there are problems with drawIndexedPrimitives. The 3d drawing in this app was developed by two different people (myself being one of them) and so some of the drawing methods and styles are different. It's an MDI Windows form app and we have two different 3d view windows. One draws the model as a whole, the other focuses in on a smaller portion of the model and allows user input to draw some objects. The 3d view that shows the whole model has no calls to drawIndexedPrimitives and it will open just fine without crashing a computer. The window that crashes the computer has several calls to indexedPrimitives. I'm kind of thinking out loud here coming up with differences between the two forms and therefore maybe the reason for the crash.
I hope this is a little more informative about what's going on in my app and will help someone shed some light on my problem.
Thanks again.

First things first. Just to make sure, does the program run correctly on all 3 machines using the reference rasterizer? The refrast bypasses the hardware (but, obviously, runs very slowly since it's all software rendering)

Some code:
This is what is done when we draw line strips. It resides in a method called DrawShape.

// build vertex buffer Point3d[] points = shape.ToPointArray(); int numVerts = points.Length; VertexBuffer vb = new VertexBuffer( typeof(CustomVertex.PositionColored), numVerts, this.device, Usage.WriteOnly, CustomVertex.PositionColored.Format, Pool.Managed); // build index buffer int[] indices = new int[numVerts+1]; for (int i=0; i < numVerts; i++) { indices[ i ] = i; } indices[numVerts] = 0; IndexBuffer ib = new IndexBuffer( typeof(int), indices.Length, this.device, Usage.WriteOnly, Pool.Managed); ib.SetData(indices,0,LockFlags.None); // set vertices CustomVertex.PositionColored[] data = (CustomVertex.PositionColored[])vb.Lock( 0, typeof(CustomVertex.PositionColored), LockFlags.None, numVerts); for (int i=0; i < numVerts; i++) { Point3d point = points[ i ]; data[ i ].Color = color.ToArgb(); data[ i ].X = (float)point.X; data[ i ].Y = (float)point.Y; data[ i ].Z = (float)point.Z; } vb.Unlock(); // draw outline of shape this.device.RenderState.FillMode = FillMode.WireFrame; this.device.SetStreamSource(0, vb, 0); this.device.Indices = ib; this.device.VertexFormat = CustomVertex.PositionColored.Format; this.device.DrawIndexedPrimitives( PrimitiveType.LineStrip, 0,0,numVerts,0,numVerts); ib.Dispose(); vb.Dispose();

The other call to drawIndexedPrimitives is a line list...we are drawing a bounding box.

int numVerts = 8; VertexBuffer vb = new VertexBuffer( typeof(CustomVertex.PositionColored), numVerts, this.device, Usage.WriteOnly, CustomVertex.PositionColored.Format, Pool.Managed); // build index buffer int[] indices = {0,1,1,2,2,3,3,0,0,4,1,5,2,6,3,7,4,5,5,6,6,7,7,4}; IndexBuffer ib = new IndexBuffer( typeof(int), indices.Length, this.device, Usage.WriteOnly, Pool.Managed); ib.SetData(indices,0,LockFlags.None); // set vertices CustomVertex.PositionColored[] data = (CustomVertex.PositionColored[])vb.Lock( 0, typeof(CustomVertex.PositionColored), LockFlags.None, numVerts); // color for (int i=0; i < numVerts; i++) { data[ i ].Color = this.boundingBoxColor.ToArgb(); } // geometry data[0].X = data[1].X = data[4].X = data[5].X = (float)this.stairway.Bounds.xmin; data[2].X = data[3].X = data[ 6 ].X = data[7].X = (float)this.stairway.Bounds.xmax; data[0].Y = data[3].Y = data[4].Y = data[7].Y = (float)this.stairway.Bounds.ymin; data[1].Y = data[2].Y = data[5].Y = data[ 6 ].Y = (float)this.stairway.Bounds.ymax; data[0].Z = data[1].Z = data[2].Z = data[3].Z = this.zmin; data[4].Z = data[5].Z = data[ 6 ].Z = data[7].Z = this.zmax; vb.Unlock(); this.device.RenderState.FillMode = FillMode.WireFrame; this.device.SetStreamSource(0, vb, 0); this.device.Indices = ib; this.device.VertexFormat = CustomVertex.PositionColored.Format; this.device.DrawIndexedPrimitives( PrimitiveType.LineList, 0,0,numVerts,0,12); ib.Dispose(); vb.Dispose();

I think these are the only two ways drawIndexedPrimitives is called.

Well, in this function we're drawing a closed polygon (wireframe) so the number of vertices is equal to the number of lines.

w.r.t to the index buffers... isn't an "int" 32bits and a "short" 16bits? they would correspond to different IB formats. Support for a 32bit index buffer is relatively rare - particularly when you've mentioned such old hardware (and integrated variants). You really should enumerate all the features you're using during application load
hth
Jack

cgraus wrote:

What graphics cards do the three PCs have ?