Forums Technical Discussion COPS "reformat" options like nuke [SOLVED]

COPS "reformat" options like nuke [SOLVED]

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AndreasWeidman
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I am probably just blind, but I can't figure out how to crop and reformat an image like I would in nuke.
In nuke I would reformat and crop to my format and have it scale by width and have a center crop.

In cops, all I can figure out is to crop from bottom or top.
Edited by AndreasWeidman - Sept. 1, 2021 17:07:36
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jsmack
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Yeah, that would be nice to have. It's quite a lot of math and hard to get right as it is now. I think you can do it with a combination of transform scale node and crop nodes.
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AndreasWeidman
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Tried that combo. Can't figure it out at least.
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AndreasWeidman
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Is there any token in Cops to get the original width/height? W/H didnt work, nor did $W or $H.
If there is a token I could write some expression
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mestela
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It's irritatingly hard. You can chref the width and height from the file cop, or use vex to query the image dimensions.

It should be much much easier.
http://www.tokeru.com/cgwiki [www.tokeru.com]
https://www.patreon.com/mattestela [www.patreon.com]
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AndreasWeidman
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Good ideas! I truly wish SideFX would give a tiny bit of love to cop2 networks once in a while (COP2s have feelings too). I doesn't have to be nuke. But its perfect for slaps and texture stuff. Polishing the basics and adding av few bits and bobs would be enough in my book.
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AndreasWeidman
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SOLVED
For anyone looking for the same thing. This is what I came up with. Just replace resx and resy with your resolution or aspect ration. Then use the same resolution in a scale node. Thanks mestela for pointing me in the right direction.

Attachments:
Screenshot from 2021-09-01 23-03-29.png (48.8 KB)

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yakymoto
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Thanks everyone for the wonderful solutions! Here is my spin on it with HDA.
Click on 'Edit Parameter Interface' and add vector2 'ar' and float 'ratio'.

Horizontal Crop:
if ( ch("ratio")<1, (res("../`opinput('.',0)`", D_XRES) - ch("hcrop2")) / 2, 0 )
if ( ch("ratio")>1, res("../`opinput('.',0)`", D_XRES), (res("../`opinput('.',0)`", D_YRES) / ch("ary")) * ch("arx") )
Vertical Crop:
if ( ch("ratio")>1, (res("../`opinput('.',0)`", D_YRES) - ch("vcrop2")) / 2, 0 )
if ( ch("ratio")<1, res("../`opinput('.',0)`", D_YRES), (res("../`opinput('.',0)`", D_XRES) / ch("arx")) * ch("ary") )
Ratio:
res("../`opinput('.',0)`", D_XRES) / res("../`opinput('.',0)`", D_YRES)

Features:
  1. Procedural path and resolution of the input node
  2. Custom aspect ratio
  3. Supports vertical and horizontal aspect ratios
  4. Packed into HDA
Edited by yakymoto - yesterday 09:48:27

Attachments:
custom_crop1.png (534.9 KB)
cop2_reformat.hda (17.7 KB)

Best regards, Stanislav Yakymenko.
Houdini artist based in Berlin, Germany.
yakymoto.com
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