Hi,
The idea is to edit a texture in real time. To do this, I get the texture
coordinates where I clicked on the model and I try to update the image as
follows ...
Texture creation:
Code:
image = new osg::Image;
image->allocateImage(tex_width, tex_height, 1, GL_RGBA, GL_UNSIGNED_BYTE);
unsigned int r = 255;
unsigned int g = 255;
unsigned int b = 0;
unsigned int a = 255;
for(int i = 0 ; i < tex_width*tex_height ; i++)
{
memcpy(image->data()+i*4 , &r, 1);
memcpy(image->data()+i*4+1, &g, 1);
memcpy(image->data()+i*4+2, &b, 1);
memcpy(image->data()+i*4+3, &a, 1);
}
// attach pbo
image->setPixelBufferObject(new osg::PixelBufferObject(image));
// push back the image to the texture
textureRect->setImage(0, image);
Update process:
Code:
float x = textCoord._v[0]*tex_width;
float y = textCoord._v[1]*tex_height;
osg::Vec4 color = textureRect->getImage(0)->getColor(x*y);
float radio = 80.0;
unsigned int r;
unsigned int g;
unsigned int b;
unsigned int a = 255;
for(int i = 0 ; i < tex_height ; i++)
{
for(int j = 0 ; j < tex_width ; j++){
osg::Vec2 t = osg::Vec2(x-j,y-i);
float dist = sqrt((t.x()*t.x())+(t.y()*t.y()));
if(dist(lower)radio){
r = 0;
g = 255;
b = 0;
}
else{
r = 255;
g = 255;
b = 255;
} memcpy(textureRect->getImage(0)->data()+i*j*4
, &r, 1);
memcpy(textureRect->getImage(0)->data()+i*j*4+1, &g, 1);
memcpy(textureRect->getImage(0)->data()+i*j*4+2, &b, 1);
memcpy(textureRect->getImage(0)->data()+i*j*4+3, &a, 1);
}
}
textureRect->getImage(0)->dirty();
osgDB::writeImageFile(*image,"sample.png");
But the idea does not work ... How can I relate the texcoords with the rows and
columns of the image?
Thank you!
Cheers,
Aitor
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=33609#33609
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