I do some projects where it is originally made at a 9 x 16 aspect ratio. Later down the road I need to make a 16 x 9 aspect ratio version of the spot. I use the same camera, but rotate my comp for the front, but when the product is revealed at the end, I cannot use the same camera to keep the composition.
This hasn't been a problem because I had been doing the product in Maya up till now. Under the camera properties in Maya, under Film Back, there is a drop down called "Fit resolution gate". If I change it to "Vertical" and flip my cameras aspect ratio, it will keep the same framing of the product (just wider now/more revealed on the sides), and I am able to use one render for two spots. I can not find any option like that in Houdini.
I hope this made sense, I appreciate you taking time to read and help if you can. Thanks.
Edit: I think I was able to get it to work through exporting it to Maya and re importing it as an fbx. Here is a visual of what I mean
Changing Camera resolution but keep the same resolution gate
4600 3 0- animationalex
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- tamte
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zjieso from the original problem
Hi Tomas, could you explain the math
there is an image with certain known width(w) height(h) and horizontal aperture(ha)
houdini computes vertical aperture(va) like this:
va = ha * h / w
then we need to compute new horizontal aperture ha2 for camera with flipped h and w and the same vertical aperture:
using the same equation from before for new camera it would be:
va2 = ha2 * h2 / w2
and substituting for what we know that:
h2 = w
w2 = h
va2 = va
we get:
va2 = ha2 * h2 / w2
va = ha2 * w / h
ha2 = va * h / w
and since we know that va = ha * h / w
that gives us:
ha2 = ha * h*h / w*w
and hence:
ha2 = ha * (h/w)^2
Edited by tamte - April 27, 2022 13:58:40
Tomas Slancik
FX Supervisor
Method Studios, NY
FX Supervisor
Method Studios, NY
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