Calculating Projector Overlap

[gcooke]

Hi,

First time setting up a 2x1 projector setup in Qlab.

Probably a dumb question, but how to I calculate the Overlap % when setting up a multi-output stage?

Both projectors are 1920x1080. Stage is approx 40' wide. Throw distance is 25'.

Thanks!

-George

[Sam Kusnetz]

Hi George

Your projector overlap will depend on the lenses on your projectors. Using information about those lenses, you’ll be able to determine how wide each projector’s image will be at 25’. Once you do, you’ll be able to back-solve the overlap.

Best

Sam

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Sam Kusnetz (he/him) | Figure 53

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[gcooke]

Got it!  Thank you!

[Greg Leeper]

I use a handy app called Blendz, which lets you enter the dimensions of your total desired coverage area, and projector resolution, and it will calculate the overlap, total pixel count, etc.  Then you can put that use that total  pixel space in Qlab to crate a new Multi-Screen Surface ( https://qlab.app/docs/v4/video/video-surface-editor/ ) , add your 2 projectors to it, and the blend/feathering will happen for you at the right place on screen,  for best results  I manually align the projectors on the screen while using the grid generated  by Blendz.  The fast WYSIWYG way is to move the corners/control points accordingly in QLAB's surface editor.

http://wookiesoft.com/BlendZ.html

Here's a Blendz alignment grid for reference - the blue area is the overlap, and then projection details:

[gcooke]

Wow.  Thank you so much!