Projection

[faimoimal]

a standard question about 3D projection.

case 1:
footage+camera imported from boujou.

I project the frame 1 of my footage on a card, using the camera imported data, i see it through my camera imported.
so on frame 1, camera = camera of projection. (same position)

Even I move my card (x,y,z) it doesn t affect the projection. The image looks the same when i see it through my camera.

case 2:
footage+camera imported from boujou

I project the frame 1 of my footage on a card. i see it through my camera but here my camera is set by myself (x,y,z) with a very different angle.
so on frame 1, camera â‰* camera of projection.

My projections works well. BUT if I move my card in Z. it does affect the projection. (scale etc…)

WHY?
If anyone has an aswer?
3d guys !?!
cheers

[Shekhar Rathore]

Frank Rueter has an nice Nuke projection tutorial here that may help you answer your question:

http://tinyurl.com/ya754zh

you can also see more of these same tutorials at higher quality here:

http://tinyurl.com/35j99a

[Anonymous]

thanks
I have checked it, and checked this one as well :
Rig Removal
Frank Rueter shows you how to cover up unwanted rigs using 3D projection. (8min 14sec)

http://www.thefoundry.co.uk/dl_file.aspx?ui=294ED4BC-62AE-45C0-B621-08600D4A7796

BUT i don t understand why does he projects the all footage on the card using the uv space, instead of project the last frame (still) on the card with a regular 3d projection.
do u understand why?

[Anonymous]

I have noticed that u loose a bit of quality when using the 3d projection into uv space vs simple 3d projection.

I have compared the two methods on one case: footage: an establishing shot-landscape. I projected on a card a still frame, rendered (render camera mode) and one using the same settings but renderin in uv mode used the new texture for my card.
The result show me that u loose a bit of quality. the texture is bit blurry using uv texturing.
Is there a way to fix this ? or as nuke rendered a splat map of the texture, so it is normal that u loose the sharpness of the original image/texture?!

[Jan]

@faimoimal 29558 wrote:

I have noticed that u loose a bit of quality when using the 3d projection into uv space vs simple 3d projection.

I have compared the two methods on one case: footage: an establishing shot-landscape. I projected on a card a still frame, rendered (render camera mode) and one using the same settings but renderin in uv mode used the new texture for my card.
The result show me that u loose a bit of quality. the texture is bit blurry using uv texturing.
Is there a way to fix this ? or as nuke rendered a splat map of the texture, so it is normal that u loose the sharpness of the original image/texture?!

…you can set the filter options to get better quality when using a 3D card within Nuke. Ths would be located in your scan line render options tab, I believe the default is cubic which might be softening your footage, etc… I might not be totally correct however I see a difference when I change it to something other than cubic like simon. This also happens when you use a transform node as well…hope that helps!

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