Re: Impossible call 'patch' inside onkeydown handler?

[Andrea V. <and...@gm...>]

Christian Walther <cwalther <at> gmx.ch> writes:

> You can't create patches at run time. What would you need that for? 
> Would it be very inconvenient to have to reload the node for it?

Ok, I understand you, I should find a workaround to this.

Well, I'm working on a lua library fot drawing simple 3d object,
as explain you before, the big problem is put the patches in the
correct geometrical order, 
So, for the moment I have operate in this manner:

I calculate all the parameters to drawing patches of my 3d object
(nx,ny,...angley...image...)
and put inside a table.

During this phase I eliminate backfaces to reduce total number of patches.

I reorder the table of the patches from farest to nearest

I cycle along the table and draw the patch, 
To do this, I use another table to store patch id, 
I reuse patches stored in this table that are always ordered from back to
front. If I found a patch in this table, I use it, otherwise I create a
new one and I append it to the table for future use.
Because the backface removal, the number of patches that I see can vary
depending on the angle of view.

So if I want to schedulate the rotation of my object, it's possible which,
for some angle of view, I need extra patches...

Now I have to predetermine the maximum number of patches and allocate
all patches before runtime.

If I eliminate backfaces removal, the problem never occur, because the 
number of the faces is always the same.

I have tryed (just for test) to enable depth buffer on SDL (before calling 
SDL_SetVideoMode( width, height, bpp, flags )

using:

SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );

but it's not sufficient, because the behaviour isn't changed.....

Bye

Andrea