Re: [Opensg-users] How to set shader parameter to vec3 array?

[Anne B. <ann...@fi...>]

Hi Carsten,

Carsten Neumann schrieb:
> 	Hello Anne,
> 
> Anne Braun wrote:
>> I'm trying to pass a vec3f array to my shader programm using the function:
>> shader->setUniformParameter(const char* name, const osg:MFVec3f &value)
>>
>> On shader side I have the parameter: uniform vec3 vectors[NUMPOINTS]
>> Using a single vector
>> shader->setUniformParameter("vectors", osg::Vec3f(0.8f, -0.2f, 0.2f)); 
>> it works fine. But using a MFVec3f it doesn't work.
> 
> uhm, your description suggests you are doing the right thing, passing a 
> MField to setUniformParameter is the way to pass arrays.
> What exactly is not working? Do you get a compiler error, an error from 
> the driver when it compiles the shader, do you get incorrect values in 
> the uniform? Also, what version of OpenSG is this with and on which 
> platform?

There are no error messages. It seems that the shader gets incorrect 
values. My OpenSG version is Opem SG 1.8

Here is again my code:
OpenSG:
	MFVec3f parameters = MFVec3f(3);
	parameters.push_back(osg::Vec3f(0.8f, -0.2f, 0.2f));
	parameters.push_back(osg::Vec3f(0.1f, 0.2f, 0.2f));
	parameters.push_back(osg::Vec3f(-0.6f, 0.5f, 0.5f));

	beginEditCP(shader);
		shader->setVertexProgram(vertexShader);
		shader->setFragmentProgram(fragmentShader);
		shader->setUniformParameter("vectors", parameters);
	endEditCP(shader);

Shader:
#define NUMPOINTS 3

uniform vec3 vectors[3];

void main(void)
{
    vec3 vector;

    ...
    for(int i = 0; i < NUMPOINTS; i++)
    {
       vector = vectors[i];
	...

To be honest, I have no idea how to debug the shader to check whether 
the values are correct. But using with a single vector instead of a 
array it works?!

Cheers,
Anne

> 
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