Maths - Ouch my head hurts!!!!

[Andrew 737]

Hi Guys

I really hope I have not worn out my welcome! 

OK so, I am trying to work out my projection throw/screen size; the infocus projector calculator is telling me that I will get a 225cm wide picture at 1.1m throw - all good but...

when this image is warped (ie curved to follow the screen) how much 'curved screen' coverage will I get?

surley *not* the 225cm of flat (straight uncurved) projection?

As ever all help 'MASSIVELY' appreciated

[HarryZ]

Hi Guys

I really hope I have not worn out my welcome! 

OK so, I am trying to work out my projection throw/screen size; the infocus projector calculator is telling me that I will get a 225cm wide picture at 1.1m throw - all good but...

when this image is warped (ie curved to follow the screen) how much 'curved screen' coverage will I get?

surley *not* the 225cm of flat (straight uncurved) projection?

As ever all help 'MASSIVELY' appreciated

Andrew,

Initially, you will get 3 images, all 225cm wide and they should have an overlap of about 20% between projector 1&2 and again between 2&3.  This overlap is necessary when using the blending software, otherwise it won't work properly.  These pics will also be quite distorted since they are flat projector images beamed on to a curved screen.

Now the task of working with the blending software to get it to look right.  A challenge for sure but once you get the hang of what you are doing, the results will be well worth the effort.  Good luck.

Harry

[Andrew 737]

Hi Guys

I really hope I have not worn out my welcome! 

OK so, I am trying to work out my projection throw/screen size; the infocus projector calculator is telling me that I will get a 225cm wide picture at 1.1m throw - all good but...

when this image is warped (ie curved to follow the screen) how much 'curved screen' coverage will I get?

surley *not* the 225cm of flat (straight uncurved) projection?

As ever all help 'MASSIVELY' appreciated

Andrew,

Initially, you will get 3 images, all 225cm wide and they should have an overlap of about 20% between projector 1&2 and again between 2&3.  This overlap is necessary when using the blending software, otherwise it won't work properly.  These pics will also be quite distorted since they are flat projector images beamed on to a curved screen.

Now the task of working with the blending software to get it to look right.  A challenge for sure but once you get the hang of what you are doing, the results will be well worth the effort.  Good luck.

Harry

Hi Harry

Thanks for the heads up on the overlap.

Just to confirm once the projector image Is warped will it still be 225cm wide or will warping short it at all?

[Sean]

Hi Andrew

A little late in your debate, but I'm the other guy with a screen from Carl. One of the best decisions I made for the sim.

Regards the warping software, you won't lose any screen real estate with the warping side of things, but you will with the blending, by the amount of the overlap. The two outer projectors need to be rotated inwards by the required amount. I'm using Nthusim and it's about 10% each side.

Sean

[Andrew 737]

Hi Andrew

A little late in your debate, but I'm the other guy with a screen from Carl. One of the best decisions I made for the sim.

Regards the warping software, you won't lose any screen real estate with the warping side of things, but you will with the blending, by the amount of the overlap. The two outer projectors need to be rotated inwards by the required amount. I'm using Nthusim and it's about 10% each side.

Sean

Hi Sean

That's great to hear - thanks.

Yes I am starting to 'get' the whole overlapping thing for me this is usefull as my screens would have been a little too wide at the height I am using - I will use 20 percent (min) overlap

The guy at Carlofet is actually called Joe! I kept calling him Carl too, until I read his sig at the bottom of his e-mail - or maybe there are a few of them work there.

[HarryZ]

Just to confirm once the projector image Is warped will it still be 225cm wide or will warping short it at all?

Yes, Warpalizing won't change the width of the image all that much.  It takes a distorted image fits it nicely to the curved screen.  Good examples of this at www.warpalizer.com.

Harry

[Sean]

Not sure about other software, but with Nthusim, the overlap ratio is fixed. You can't choose how much to overlap. You just do as the software says! I wouldn't worry about your image being too wide. You just won't see the end bits. It's when you haven't got enough that's the problem!

Sean

[Andrew 737]

Not sure about other software, but with Nthusim, the overlap ratio is fixed. You can't choose how much to overlap. You just do as the software says! I wouldn't worry about your image being too wide. You just won't see the end bits. It's when you haven't got enough that's the problem!

Sean

A Classic case of 'cant see wood for trees'; I never considered not seeing the 'end bits'

Doh!

Thanks Sean

With regards to overlap, I have assumed overlap is was configurable because of the conversations I have had about Warpalizer - it may not be, as you say.

[Flying_Fox]

Not sure about other software, but with Nthusim, the overlap ratio is fixed. You can't choose how much to overlap. You just do as the software says! I wouldn't worry about your image being too wide. You just won't see the end bits. It's when you haven't got enough that's the problem!

Sean

Immersive Display Lite (and Pro) allows any overlap ratio for blending.

Nick

[Andrew 737]

Not sure about other software, but with Nthusim, the overlap ratio is fixed. You can't choose how much to overlap. You just do as the software says! I wouldn't worry about your image being too wide. You just won't see the end bits. It's when you haven't got enough that's the problem!

Sean

Immersive Display Lite (and Pro) allows any overlap ratio for blending.

Nick

Thank you for the Tip