ofVboMesh vs. ofMesh

beginners
#1

Hi OF people,
I got really excited after i found some good glsl shader examples and want to back to OpenGL world.

Then i try to draw something with ofVboMesh as people suggested to use it than ofMesh.
myVboMesh.draw() is slower than myMesh.draw()

I set GL_DYNAMIC_DRAW option for VboMesh but still the same.

I think this has to do with my un-clever indexing of mesh index.

i use ofxTriangle to convert silhlouettes captured from ofxmskinect to mesh. ( i add random vertices before i do trianglulation and erase triangles that’s outside of the polyline(contour).)

so the mesh is changing a lot and my triangle has independent index set. so I set mesh mode to OF_PRIMITIVE_TRIANGLE.

So i kindof conclude, only when i’m confident dealing with mesh, i use VBO otherwise i get lousy results since i’m dummer than graphics card.

Is this make sense?

i’m asking this since i saw somewhere in OF forum that ofVboMesh is good for STATIC mesh…

thank you in advance.

hojun

#2

i’ve noticed in my computer ofVboMesh is slower than ofMesh if it changes a lot but i think it is because of my graphics card which has shared memory. In any other case it should be at least as fast as ofMesh.

#3

Hi arturo,
my graphics card is GTX580
and it says it’s using shared memory as well.

i’ll take a look at how shared memory architecture is influencing the performance.

thank you!

#4

Hi @hhjjj …

Did you got to any “conclusion” about this issue ?
Any ideas of whether or not it’s better to use ofVboMEsh instead of ofMesh in some situation ?

I’m facing something similar … i’ve a very varying geometry on each frame and i need to boost up performance … but i can’t get to know if VboMesh is faster or not then ofMesh …

Any ideas ?

e*