Set array of vectors via SetEffectParam

[Shadowsong]

Basically what I am trying to do is let my shader have access to an array of vectors.

So I define the array inside the shader:

Code:

float3 VectorArray[20];

Now during runtime, I want to fill this array with data. I tried the following:

Code:

cTV_3DVECTOR *vectors[20];
for(int i=0; i<20; i++)
    vectors[i] = new cTV_3DVECTOR(12, 34, 56);
MyShader->SetEffectParamVectorArray3("VectorArray", vectors[0], 20);

This compiles and all, but during runtime, nothing happens. It seems like the shader can't access the data, thus I guess it doesn't get filled correctly. Maybe I am not using the correct SetEffectParam method?

I hope someone can help

[Aki]

Code:

MyShader->SetEffectParamVectorArray3("VectorArray", vectors[0], 20);

I've never used the VectorArray method, and instead, did the following:

Code:

MyShader->SetEffectParamVector3("VectorArray["+i.ToString()+"]", vectors[i]);

[jviper]

Perhaps a better way to test whether the data went through is check GetEffectParamVectorArray3

[Toaster]

This is wrong:

Code:

MyShader->SetEffectParamVectorArray3("VectorArray", vectors[0], 20);

It should be:

Code:

MyShader->SetEffectParamVectorArray3("VectorArray", vectors, 20);

It needs to be outside of the loop and after you set the vectors data.

I cant imagine this would ever work:

Code:

MyShader->SetEffectParamVector3("VectorArray["+i.ToString()+"]", vectors[i]);

but I guess it could in some weird way.

-Toaster

[AriusEso]

vectors[0] is not incorrect in C++. He will likely get type errors if he does it your way. Something like "error convert parameter from float (*)[20] to float *".

Do this:

Code:

cTV_3DVECTOR vectors[20];

vectors[i] = Vector3(etc, etc, etc);

MyShader->SetEffectParamVectorArray3("VectorArray", &vectors[0], 20);

Merry Ragemass.