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basilok

Help!! Projection on sphere

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Hi,

 

we've been asked to do a projection on sphere shape from outside surface and speak frankly we have no clue how to do it!!

 

i appreciate if someone can helps us.

 

this is initial information we have:

 

 

1- the sphere diameter is 3 M

2- the projection distance from the sphere is open

3- we have 4 Christie projectors 20K S+with twist card available

4- lenses available 1.5-2:1 and 2.8-4.3:1

5- WO 5.51 

 

what I am looking for:

 

1- what would be the projection size

2- How many projectors we need for this project

3- Projectors distance from the sphere according to the lenses we have

4- what would be the way to do the edge blending on the sphere surface

5-any other information or details we need to know!!

 

thanks

 

Basil

 

 

 

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Hi Basil,

I give you some tips with regards to each point:

 

1- the sphere diameter is 3 M

2- the projection distance from the sphere is open

3- we have 4 Christie projectors 20K S+with twist card available

4- lenses available 1.5-2:1 and 2.8-4.3:1

5- WO 5.51 

 

Ok, take a look to the projection central site and use their calculator to consider the dimensions and distances for each lenses http://www.projectorcentral.com

 

what I am looking for:

 

1- what would be the projection size

 

You are subjected to the 3 meter spherical diameter, so keep in mind you have to fill up 3 meters in height for each projector, and then calculate (depending on the aspect ratio you're gonna use) the usable width in Watchout.

 

2- How many projectors we need for this project

 

4 is ok.

 

3- Projectors distance from the sphere according to the lenses we have

 

Again, http://www.projectorcentral.com

 

4- what would be the way to do the edge blending on the sphere surface

 

I cant't give you a link, but the Dataton guys I'm sure they have an already made example program.

 

5-any other information or details we need to know!!

 

 

 

Take a look to the www.showsage.com site, they use to have a very nice links and examples.
In fact, There's a hard work to do then with the media content and would be hard to explain, but maybe there are some examples on how to carry on this job.
 
My best wishes.
Sergi jover
 

thanks

 

Basil

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Hi Basil,

 

There is also a project by Dataton, to make a sphere that is explained, maybe they can share the link for you at the forum. 

You have to think that you will put your sphere inside a cube so you will cover as much as you can with 4 projectors, one for each side of the cube with out top and down. 

 

So you can to cover 3m height at least. 

 

Best regards

 

Adela

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Hi,

 

Adela is right, there is an old project (WO3) for a sphere setup, it's not ideal but it might help a bit.

 

The ideal setup and positioning of the projector is dead center on the equator of the sphere, with 4 projectors.

Preferably quite far from the sphere, the 2.8-4.3:1 lens is to be preferred here (see drawings in the project below).

 

This means that you can take advantage of the mirroring horisontally & vertically-feature of the geometry adjustments in WATCHOUT,

making the setup far easier. Please see P163 in the WATCHOUT 5.2 User Guide.

 

Link: http://dataton.com/downloads/watchout/support/education/sphere/

 

/jonas

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Hi Jonas,

 

thank you for the information, just a quick question, i saw in the project you shared that there is only three blending areas, what about the the last one where the 1st projectors join with the last one?!

 

regards,

 

Basil

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Hi Basil,

 

As with any 360 degree projection, one adds a "dummy" Display on each side.

The overlap here needs to be the same as inside the actually used screen area, to work properly.

 

Hope this helps,

 

/jonas

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Hi

I think its easyer with 2 more Projektors, because of the Deep of the Focus.

I would like to use the Twist and Blending via the Christies. (We use the M Serie, its easy with it)

Also easy is the Color Balance and Blacklevel Setup inside the Projektors. Use the Christie Lens Calculator to find the better Lens. I think the short One is good, but it depends on the possible position of the Projektor (rigging points?)

 

Greetings from Germany

Daniel

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Daniel,

 

I highly doubt more projectors than 4 will make things easier here.

Depth of focus will work, I wouldn't worry about that. 

Also if you're to close to the sphere with the projector (ie wide-angle lens) you'll not cover as much of the top

and bottom of the sphere as would from longer distance.

 

But that's my 2 cents,

 

/jonas

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