Re: Lights and Alpha

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Since your using the vertexformat
"CustomVertex.PositionNormalTextured.Format" , you have no color info. When
using lights, you'll need to specify a material with a specific color before
drawing the verticies.

I ran into the same problem when I first started playing with Mesh objects.

"Saulo Machado" wrote:

> You're unlocking your vertexBuffer without even locking it? Try changing your
> code for the vertexBuffer creation this way:
>
> ////////////////////////// CREATE THE VERTEXT BUFFER
> vertexBuffer = new
> VertexBuffer(typeof(CustomVertex.PositionNormalTextured), 4, dev,
> Usage.WriteOnly, CustomVertex.PositionNormalTextured.Format, Pool.Default);
>
> (...) - Vertex creation code
>
> vb.SetData(verts,0,LockFlags.None);
> /////////////////////////////////////////////////////////////////
>
> And, before setting up lights, turn it on:
>
> mDevice.RenderState.Lighting = true;
>
> To see if your normal is working, set this RenderState:
>
> mDevice.RenderState.CullMode = Cull.None;
>
> Then you can try the Normal coordinates. I suggest you should set the
> normals coordinates to point at z+ direction - (0,0,1).
>
>
>
> "Iain" wrote:
>
> > On Mon, 19 Sep 2005 15:22:01 -0700, Saulo Machado wrote:
> >
> > > Assuming you created your quad without using lights you must not have created
> > > ?Vertices with "Normals". It's impossible to have lighting in DirectX without
> > > normals in your vertices. If you want lights... go there where you created
> > > yur vertices and vertexBuffer and add normals.
> > >
> > Thanks.
> >
> > I've done that and it has made no difference.
> >
> > ////////////////////////// CREATE THE VERTEXT BUFFER
> > vertexBuffer =new VertexBuffer(typeof(CustomVertex.PositionNormalTextured), 4, dev,
> Usage.WriteOnly, CustomVertex.PositionNormalTextured.Format,
> Pool.Default);
> >
> > CustomVertex.PositionNormalTextured[] verts =
> > (CustomVertex.PositionNormalTextured[])vertexBuffer.Lock(0, 0);
> > verts[0].Position = new Vector3(-1, -1, 0);
> > verts[1].Position = new Vector3(-1, 1, 0);
> > verts[2].Position = new Vector3(1, -1, 0);
> > verts[3].Position = new Vector3(1, 1, 0);
> >
> > verts[0].Normal = new Vector3(0, 0, -1);
> > verts[1].Normal = new Vector3(0, 0, -1);
> > verts[2].Normal = new Vector3(0, 0, -1);
> > verts[3].Normal = new Vector3(0, 0, -1);
> >
> > verts[0].Tu = 0; verts[0].Tv = 1;
> > verts[1].Tu = 0; verts[1].Tv = 0;
> > verts[2].Tu = 1; verts[2].Tv = 1;
> > verts[3].Tu = 1; verts[3].Tv = 0;
> > vertexBuffer.Unlock();
> >
> > /////////////////////////////// SET UP LIGHTS
> > mDevice.Lights[0].Type = LightType.Directional;
> > mDevice.Lights[0].Diffuse = Color.White;
> > mDevice.Lights[0].Direction = new Vector3(0, 1, 1);
> > mDevice.Lights[0].Enabled = true;
> >
> >
> > ////////////////////////////////// DRAW
> > mDevice.RenderState.Lighting = true;
> > mDevice.RenderState.AlphaBlendEnable = true;
> > mDevice.RenderState.Ambient = Color.White;
> > mDevice.RenderState.SourceBlend = Blend.SourceAlpha;
> > mDevice.RenderState.DestinationBlend = Blend.InvSourceAlpha;
> > mDevice.RenderState.CullMode = Cull.None;
> > mDevice.SetTexture(0, texture);
> > mDevice.RenderState.ZBufferEnable = true;
> > mDevice.SetStreamSource(0, vertexBuffer, 0);
> > mDevice.VertexFormat = CustomVertex.PositionNormalTextured.Format;
> > mDevice.DrawPrimitives(PrimitiveType.TriangleStrip, 0, 2);
> >
> >
> > (I have tried various orientations of the normals and lighting direction in
> > case my cartesian head is on backwards - still no display when lighting is
> > turned on!)
> >
> > Any suggestions gratefully received!
> >
> >
> >
> > Iain
> > --
> > Iain Downs (DirectShow MVP)
> > Commercial Software Therapist
> > www.idcl.co.uk
> >
.

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