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  Why hasn't shear been implemented into the matrix classes?  (Read 1835 times)
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Offline K.I.L.E.R

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« Posted 2005-11-28 16:45:53 »

As the question suggests. Smiley

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Offline tom
« Reply #1 - Posted 2005-11-28 17:33:09 »

Probably because no one has had any need for it. It's a uncommon operation and not even javax.vecmath has a shear functions as far as I can tell.

Offline K.I.L.E.R

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« Reply #2 - Posted 2005-11-29 04:30:17 »

I thought shearing was done a lot when you wanted to show stress/strain or even flags being waved by the wind.

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Online princec

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« Reply #3 - Posted 2005-11-29 10:29:58 »

Nah, you'd do that just by dividing your flag up into a grid of quads and then perturbing the vertices in a clever way. Or use a shader.

Cas Smiley

Offline anarchotron

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« Reply #4 - Posted 2005-12-01 06:05:11 »

You can get a shear effect by using non-orthogonal basis vectors for the matrix, as long as you don't get too carried away.
Offline K.I.L.E.R

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« Reply #5 - Posted 2005-12-01 06:19:44 »

You can get a shear effect by using non-orthogonal basis vectors for the matrix, as long as you don't get too carried away.

Oh yeh. I didn't think of that.
In the end though it doesn't matter as Princec said that anything requiring a shear is best done on the GPU due to performance reasons.

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Offline Orangy Tang

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« Reply #6 - Posted 2005-12-01 11:13:12 »

Oh yeh. I didn't think of that.
In the end though it doesn't matter as Princec said that anything requiring a shear is best done on the GPU due to performance reasons.
And where exactly do you think the heavy lifting of a shear operation is actually done? Sheers can be useful for cheapass shadows though. Smiley

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