HLSL Matrix

[joschy]

Hello,
i try to rebuild a simple shader example from AMD's RenderMonkey. I need therefor two matrixes, WORLDVIEWPROJECTION & VIEW, but it seems that only one matrix at the time is possible. See the attached pic... Or do i something wrong?

joschy

[joschy]

ok, i got it, but...

[// Vertex shader program output
struct VS_OUTPUT
{
float4 Pos: POSITION;
float2 texCoord: TEXCOORD0;
float color: TEXCOORD1;
};


// Vertex Shader Program

VS_OUTPUT VS(float4 Pos: POSITION )
{
VS_OUTPUT Output;

float3 pos;

// Billboard the quads.
// The view matrix gives us our right and up vectors.
pos = 5 * Pos.z * (Pos.x * View_matrix[0]+ Pos.y * View_matrix[1]);

// Transform the vertex from 3D object space to 2D screen space.
Output.Pos = mul(float4(pos, 1), WorldViewProjection);
//Output.Pos = mul(Pos, WorldViewProjection);
Output.texCoord = Pos.xy;
Output.color = Pos.z;
return Output;

}
]

The poly should face to the view, but it doesn't. Any suggestions why? Pic from the RenderMonky screen attached.

joschy

[joschy]

mmmhh, it seems that these line is different calculated:
[pos = 15 * Pos.z * (Pos.x * view_matrix[0] + Pos.y * view_matrix[1]);]

[joschy]

I´ve reduced all the VS stuff and compare it again. RenderMonkey uses Dotproduct operations where Ventuz uses mul & mad operations, interesting..

[joschy]

it works, have to have the right orientation of the mesh

cheers, joschy