Horizontal shift in V-Ray

Gijs · March 3, 2021, 5:05pm

@ALTO @Micha can you check if this works as you would expect?

studiogijs/pythonscripts/blob/master/vray/guessHorizontalShift.py

import Rhino
import rhinoscriptsyntax as rs
import math
import System

def Main(option):
    if option == 0:
        guessHorizontalShift()
    if option == 1:
        resetHorizontalShift()
    if option == 2:
        printHorizontalShift()
    else:
        return

def guessHorizontalShift():
    
    """
    This script will correct the horizontal distortion and set it in the V-Ray Camera.
    It levels the camera for this correction to work well and resets

This file has been truncated. show original

Micha · March 3, 2021, 6:41pm

Hi @Gijs

I’m very curious for a solution for a horizontal shift correction too. I don’t need it often, but if needed, than it was cumbersome to get the right output.

Unfortunately I’m not very familiar with python scripts. I use python scripts at buttons scripts like this:

! _-RunPythonScript (

)

What should I copy between the ( )?

-Micha

Gijs · March 3, 2021, 6:43pm

Instead of () “full path to .py inside double quotes”

Micha · March 3, 2021, 6:46pm

I tried it now and got this message.

Gijs · March 3, 2021, 6:53pm

How did you download it? Try downloading the raw file

Micha · March 3, 2021, 6:57pm

It was a direct download of the py file.

Gijs · March 3, 2021, 6:59pm

Hmm strange. I’ll send you the py file that I know works to see if it matters by pm.

Micha · March 3, 2021, 7:07pm

Great!!! No error message and it works. Should be a V-Ray standard tool. Thank you very much!

Gijs · March 3, 2021, 9:06pm

I uploaded a new version with options to report current horizontal shift and to reset the current shift. Usage:

! _-RunPythonScript “fullpath\to\guessHorizontalshift.py” 0 >guess
! _-RunPythonScript “fullpath\to\guessHorizontalshift.py” 1 >reset
! _-RunPythonScript “fullpath\to\guessHorizontalshift.py” 2 >print

ALTO · March 4, 2021, 7:59am

Thank you Gijs, it works quite good!
I see it fails with some “extreme” camera angle, but i don’t mind it shouldn’t be used in that way.

Some notes: it works also with Vray Next, and haha it call me stupid…

Still think for my needs the Horizontal offset is the right tool, unfortunately it doesn’t work in real-time so it’s very hard to use.

Micha · March 5, 2021, 7:06am

@Gijs I used it for a current project and I’m very happy about the easy usage and good result. Thank you very much. I will use this option more often now.

@andy Could a horizontal correction not be added as an option for the Rhino viewport too like the two-point-perspective? Would be easier if the correction could be seen at the viewport and be save to the named view.

Gijs · March 5, 2021, 7:30am

FYI: It saves in snapshots, like all the camera settings. (At least in Rhino V7.4/ V-Ray 5.1)

bilico · March 20, 2021, 12:42am

on Rhino V7 / V-Ray 5

how do i download?
how do i install?
how to use ?

thanks

bilico · March 20, 2021, 1:58am

I am also receiving the message
It was a direct download of the py file.

bilico · March 20, 2021, 3:25am

I already got it

thanks

Gijs · March 28, 2021, 11:22pm

@bilico @Micha @ALTO apparently I did not correct the correction factor correctly, I’ve now updated it and should work for every angle. pls. let me know if it doesn’t.

bilico · March 28, 2021, 11:56pm

tell me one thing

when we design a scenery in rhino with sunlight:

should the scenario be above the default grid?
or does it make a difference?

does this plugin have the same function as the tilt / shift lens of professional photo machines?

Gijs · March 29, 2021, 12:04am

yes

I don’t understand this question, but if you have other (unrelated) questions, please open a separate thread for this to keep the forum organized

bilico · March 29, 2021, 12:11am

how is this plugin used?
Do you have a manual?
i installed on rhino 7

Gijs · March 29, 2021, 12:30am

simply save the .py file to a location on your drive. For example if you save this .py file in d:\scripts\vray then:
make aliases for (to set horizontal shift):
!-RunPythonScript "d:\scripts\vray\guessHorizontalShift.py" 0

Note that it only will affect V-Ray rendering, not the viewport
(to reset):
!-RunPythonScript "d:\scripts\vray\guessHorizontalShift.py" 1