View frustrum manipulation

Asterisk Man · Post by **Asterisk Man** » Tue Jul 13, 2004 5:17 am

Is there any way of manipulating the view frustrum of a camera to enlarge it, in all directions, by something like 10%, or 50 pixels/units, without enlarging the actual camera view frustrum? (Like creating a new frustrum with enhanced values)

The reason I'm asking is that, by doing view frustrum culling, I'm losing some primitives I shouldn't be, because the frustrum's planes aren't actually behind any of the corners, so they think that the primitive doesnt exist.

thesmileman · Post by **thesmileman** » Tue Jul 13, 2004 5:56 am

are you asking in general or in Irrlicht?

Asterisk Man · Post by **Asterisk Man** » Tue Jul 13, 2004 3:37 pm

In Irrlicht

zola · Post by **zola** » Thu Jul 15, 2004 2:29 pm

You could use the AABB of the view frustum for culling.

Or do the following:

matrix4 mat;
mat.setScale(Vector3(0.1,0.1,0.1));
SViewFrustrum myFrust;
myFrust.transform(mat);

This scales the frustrum by factory 0.1 in every direction.
E.v. You have to make sure You don't accidently scale the original frustrum.

Tom

Asterisk Man · Post by **Asterisk Man** » Thu Jul 15, 2004 8:50 pm

Would't this scale the frustrum to a 10th of its size?

thesmileman · Post by **thesmileman** » Thu Jul 15, 2004 9:09 pm

I believe it would. He must have read your question incorrectly.

Asterisk Man · Post by **Asterisk Man** » Thu Jul 15, 2004 10:31 pm

Probably, but by setting the scale to vector3df(1.1f,1.1f,1.1f) I should get the effect he's talking about. Tnx man! Ill sure try this