Projection

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  • #203298
    faimoimal
    Participant

    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

    #218599
    Shekhar Rathore
    Participant

    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

    #218597
    Anonymous
    Inactive

    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?

    #218598
    Anonymous
    Inactive

    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?!

    #218596
    Jan
    Participant

    @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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