Added culling sample.

Added culling sample.


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=45993

[petersont, 2010-04-27 22:37:12]

So, this doesn't get the exact same results that the plugin does, but it culls
stuff, and it doesn't cull anything that should get drawn as far as I can see.

[greggman, 2010-04-29 03:49:01]

A few random comments otherwise LGTM

http://codereview.chromium.org/1703014/diff/1/7
File samples/o3d-webgl/bounding_box.js (right):

http://codereview.chromium.org/1703014/diff/1/7#newcode268
samples/o3d-webgl/bounding_box.js:268: var worldViewProjection = [[], [], [],
[]];
It doesn't seem like you want to do world * view * projection here because it
assumes that's what makes up the correct matrix for the user's use case which
may not be world * view * projection.

http://codereview.chromium.org/1703014/diff/1/12
File samples/o3d-webgl/shape.js (right):

http://codereview.chromium.org/1703014/diff/1/12#newcode133
samples/o3d-webgl/shape.js:133: if (!element.boundingBox.inFrustum_(world, view,
projection)) {
You'd probably gain some performance if you computed the worldViewProjection
here and saved it at line 142.  Otherwise you're doing a 2 matrix multiplies
twice for each draw element. Once here for culling and again for drawing.