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  1. #541
    Lead Character Artist kfinla's Avatar
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    I was thinking I could use the render buffers, to drive the material color, but not much luck so far. I just discovered the store extra buffers node.

  2. #542
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    Quote Originally Posted by kfinla View Post
    ...What I want to do is colour instances based on the surface of the model underneath the instances are applied on.
    ...
    There was this thread, may be it could inspire you,
    http://forums.newtek.com/showthread.php?t=124364

    Denis.

  3. #543
    Lead Character Artist kfinla's Avatar
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    I can't thank you enough for your help Denis, I am using your nodes left right and center on this project. That link was helpful.. I haven't quite solved my issue. I am trying to use an object with UV's, a image texture, and sample from that image and have my instances inherit colour from it. My initial tests showed I had to use a projection. That is not going to work on a human/complex object.

    Do you have any other suggestions, or am I blind, and the answer is in that thread? I saw the blue and orange chess board, but it is flat and can conveniently be planar projected to.

    I was thinking I might be able to use the buffers/filters pack and grab colour off the model that way.
    Last edited by kfinla; 07-11-2012 at 04:15 PM.

  4. #544
    aręte... adk's Avatar
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    Quote Originally Posted by kfinla View Post
    I can't thank you enough for your help Denis, I am using your nodes left right and center on this project. That link was helpful.. I haven't quite solved my issue. I am trying to use an object with UV's, a image texture, and sample from that image and have my instances inherit colour from it. My initial tests showed I had to use a projection. That is not going to work on a human/complex object.

    Do you have any other suggestions, or am I blind, and the answer is in that thread? I saw the blue and orange chess board, but it is flat and can conveniently be planar projected to.

    I was thinking I might be able to use the buffers/filters pack and grab colour off the model that way.

    You mean something like this kfinla ?
    In this case all the little cubes that make up Basil are instances of one little cube.

    http://forums.newtek.com/showthread.php?t=126025
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  5. #545
    Lead Character Artist kfinla's Avatar
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    Quote Originally Posted by adk View Post
    You mean something like this kfinla ?
    In this case all the little cubes that make up Basil are instances of one little cube.

    http://forums.newtek.com/showthread.php?t=126025
    Yes! I'd love to know how you are doing that, as I'm guessing many others would. I can't help but notice you haven't followed up the "how" part in your thread

    I've been scratching my head all day how to sample the colour of a surface and pass that onto an instance based on instance location. The kicker being a UV'd object.

    I would love to know. If you only wanna tell me thats fine too. LOL

  6. #546
    aręte... adk's Avatar
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    Not a problem mate ... & apologies to anyone that's been waiting for that follow up. I've always meant to share it, but wanted to push the whole idea a bit more into something a bit more polished (my little corny proof of concept attached - Basil makes an appearance later on) before I got onto explaining what the heck I did.

    I got about 1/3 of the way there before some urgent external & internal projects totally knocked my time out (still not done with those).

    I'll get onto putting something proper & hopefully simple together in the next week or so for you & anyone else who is interested. In a nutshell it's one cube, instanced onto a point grid where a mesh's proximity to that grid (Basil in this case ) drives the location. The hard part is controlling the knock out point, where the new cube mesh overlaps the underlying mesh & texturing the sucker.

    This is using instancing, DP's nearest point & a few simple texture projection techniques using the idea in that thread that Denis posted
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    Last edited by adk; 07-11-2012 at 10:43 PM.

  7. #547
    aręte... adk's Avatar
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    ... here's a basic explanation if anyone else is interested.
    Nothing to do with Denis's Extra Buffer Nodes (sorry for the side track) but it does use his Replace Spot & Nearest Point node. Would be impossible without those. Cheers Denis !

    http://forums.newtek.com/showthread....wpost&t=129290

  8. #548
    Lead Character Artist kfinla's Avatar
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    Hey Guys, thanks for all your help. So I am still trying to work around the "replace spot" node not liking (or over writing UV position data)

    I have a complexly UV'd object so using a traditional projection type to transfer colour to my instances will not cut it. I have successful examples on cubes etc.

    I wanted to ask. Is it possible to sample the renderbuffer color, or raw color etc.. and pass that along to the replace spot node in a surface node graph?

    So far I have had no luck with the store buffer, get buffer. But I also have no previous experience(success) with these nodes. I am under the impression the renderbuffer node only works in the image filter node graph not in the surfacing graph where I want it.

    Should I be extracting the renderbuffer , store extra buffer data from the pixel filter graph?, and then piping into my material surface graph with the get extra buffer node.

    Basically I want the final colour of my object on a per pixel basis, and I want to colour my instances to inherit that.

    I don't have tons of time to sort this out, but I'm also curious if long term, the "replace spot" node could have a reference object drop down to optionally use the UV data from?
    Last edited by kfinla; 07-15-2012 at 08:22 AM.

  9. #549
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    Quote Originally Posted by kfinla View Post
    Hey Guys, thanks for all your help. So I am still trying to work around the "replace spot" node not liking (or over writing UV position data)

    I have a complexly UV'd object so using a traditional projection type to transfer colour to my instances will not cut it. I have successful examples on cubes etc..

    ...I don't have tons of time to sort this out, but I'm also curious if long term, the "replace spot" node could have a reference object drop down to optionally use the UV data from?
    Not possible to work this way with UV Map,
    because UV coordinates are not really present or
    transmitted in Surfacing, just accessible in a node
    in its internal evaluation.

    Quote Originally Posted by kfinla View Post
    I wanted to ask. Is it possible to sample the renderbuffer color, or raw color etc.. and pass that along to the replace spot node in a surface node graph?

    So far I have had no luck with the store buffer, get buffer. But I also have no previous experience(success) with these nodes. I am under the impression the renderbuffer node only works in the image filter node graph not in the surfacing graph where I want it.

    Should I be extracting the renderbuffer , store extra buffer data from the pixel filter graph?, and then piping into my material surface graph with the get extra buffer node.

    Basically I want the final colour of my object on a per pixel basis, and I want to colour my instances to inherit that.
    Not possible to reverse the rendering process,
    surfaces are evaluated, then Buffers are filled and Surfacing is no
    more evaluated, DP Filter Pixel Filter node editor allows a kind of
    post-process rendering but surfacing is setup in the pixel context.

    What you describe looks like a job for compositing, but pasting
    a surface over another is not 'replacing' spot at a "Surfacing" level.


    Denis.

  10. #550
    Almost newbie Cageman's Avatar
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    I wonder...

    Would it be possible to do for MBlur that has been done for DOF? LW has motionvector buffers, and I guess that a MBlur node has to be written to do the magic, but... would it be possible?
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  11. #551
    LightWave Cop erikals's Avatar
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    hm, that's interesting...

    could be guess...
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  12. #552
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    DP Filter has been updated, versions 9.6, 10 and 11, win32 yet,
    A change,
    in Image Filter node editor, with "Replace Buffer" Alpha mode, the root
    Color input is no more rescaled by Alpha input.

    New nodes,
    Histogram, Limit, and Linear Tone Map nodes in "Filter" folder.
    Vector Blur, Camera Response, Grain, Vignetting nodes in "Effect".

    Click image for larger version. 

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    Click image for larger version. 

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    Thanks to Gerardo Estrada, for his intensive testings,
    advices and great suggestions.

    Denis.

  13. #553
    AWESOME filters, Denis!

    Thank you very much!



    Gerardo

  14. #554
    Stuck in a very big cube Waves of light's Avatar
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    Quote Originally Posted by dpont View Post
    DP Filter has been updated, versions 9.6, 10 and 11, win32 yet,
    A change,
    in Image Filter node editor, with "Replace Buffer" Alpha mode, the root
    Color input is no more rescaled by Alpha input.

    New nodes,
    Histogram, Limit, and Linear Tone Map nodes in "Filter" folder.
    Vector Blur, Camera Response, Grain, Vignetting nodes in "Effect".

    Click image for larger version. 

Name:	Histogram.gif 
Views:	145 
Size:	3.2 KB 
ID:	106503

    Click image for larger version. 

Name:	grain-roses.gif 
Views:	212 
Size:	1.39 MB 
ID:	106502


    Thanks to Gerardo Estrada, for his intensive testings,
    advices and great suggestions.

    Denis.
    Good god Denis, do you ever sleep. Thank you.


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  15. #555
    wow. thanks so much Denis (and Gerardo)

 

 
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