Re: [Flightgear-devel] render-to-texture XML animation

[<tia...@sa...>]

Thanks for the replies.

I'm continuing the work and i've already used the f-16 HUD as a texture 
target with sucess, but i have some questions regarding the correctness 
of the methods i'm using:

1)
right now it's usage is like this:

     <animation>
         <type>rttflat</type>
         <object>sphere</object>
         <target>hud.rgb</target>
     </animation>

sphere is the object to be rendered and hud.rgb is the texture that will 
be replaced by the generated one

to find the target, i'm going using:

     ssgEntity * root = _branch;
     while(root->getNumParents()!=0) root = root->getParent(0);

and then searching the branchs for the target texture.
This is because i think it would be nicer for the aircraft makers to 
have the target anywhere, and not necessarily in the branch.

2)
  the rendering is done "by hand" like this:

void RTTFlatAnim::drawBranch(ssgEntity *node)
{
     if(node->isAKindOf(ssgTypeLeaf()))
     {
         ((ssgLeaf*)node)->draw();
         glLoadIdentity();
         return;
     }

     if(node->isAKindOf(ssgTypeTransform()))
     {
         sgMat4 mat;
         ((ssgTransform*)node)->getTransform(mat);
         glMultMatrixf((float*)mat);
     }

     int nKids = node->getNumKids();

     for (int i = 0; i < nKids; i++)
     {
         ((ssgLeaf*)((ssgBranch*)node)->getKid(i))->draw();
         drawBranch(((ssgBranch*)node)->getKid(i));
     }
}

i'm afraid this could be a problem because i want all other animations 
to be respected for rendering to texture.

I thought about using callbacks, but i'm a little confused.

Any help/ideas are welcome :)

Cheers,
Tiago