On 02/10/14 09:16 PM, DRC wrote:
> Note that there are actually 61 spheres in the default configuration (20
> per ring + the 1 in the center), so apparently the polygon limit is
> around 60,000 per sphere. It might simply be that the polygon count is
> clamped to a 16-bit value or something.
Ok, I won't be lazy. `apt-get source libglu1-mesa` and a little
LibreOffice Calc later the restriction is quite plain:
quad.c:
#define CACHE_SIZE 240
...
gluSphere(GLUquadric *qobj, GLdouble radius, GLint slices, GLint stacks)
if (slices >= CACHE_SIZE) slices = CACHE_SIZE-1;
if (stacks >= CACHE_SIZE) stacks = CACHE_SIZE-1;
And the solid drawing path is roughly:
(glVertex + glNormal) * (slice*2 + 2 + (stacks -2)*slices*2)
Thus max ROPs/sphere = 227532, * 61 spheres = 13879452 total ROPs.
Looks like the easiest path to increased poly count is to increase the
number of spheres.
-Nathan
--
Nathan Kidd OpenText Connectivity Solutions nk...@opentext.com
Software Developer http://connectivity.opentext.com +1 905-762-6001
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