[solved]How to create a mesh with more than 65536 vertices

Rockeye · Post by **Rockeye** » Thu Jul 12, 2007 3:20 pm

I think the question is clear :

I would like to build a mesh during runtime, with more than 2^16 vertices using ManualObject.
Unfortunatelly, vertices index is limited to 16bits...

Is there an other way for doing that ?

Post by **sinbad** » Thu Jul 12, 2007 3:37 pm

Indexes can be 32-bit too, see the HardwareIndexBuffer API reference.

Rockeye · Post by **Rockeye** » Thu Jul 12, 2007 5:24 pm

thanks !

but I am not sure how to specify to a manualObject a HardwarePixelBuffer...

can I just call "estimateVertexCount()" or "resizeTempVertexBufferIfNeeded" and Ogre adapts itself to use a 32bit index ?

Post by **sinbad** » Thu Jul 12, 2007 5:54 pm

ManualObject only supports 16-bit indexes for now, true - it could be extended to support 32-bit fairly easily but if you're dealing with objects this size it would pay you to go directly to Mesh and avoid the overhead ManualObject incurs from being 'friendlier'. And remember, it may be more efficient to use multiple 16-bit sections (of a ManulObject or SubMesh in a Mesh) since 32-bit indexes use 2x the bandwidth and some older cards hate them.

Rockeye · Post by **Rockeye** » Thu Jul 12, 2007 8:02 pm

thank you for this complete answer !