Point Cloud and Node Values

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Old 09 September 2011   #1
Point Cloud and Node Values

Hey guys,

So its my first time posting in the Nuke Forum but here goes. I got 2 questions at the moment. Is there a way to drive the value of the exposure node based on another plate ...

Also how do you select points in a point cloud ... thanks ...
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Darvin K. Manwah - Matte Painter & Digital Compositor
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Old 09 September 2011   #2
Originally Posted by darvinkmanwah: So its my first time posting in the Nuke Forum but here goes. I got 2 questions at the moment. Is there a way to drive the value of the exposure node based on another plate ...
yes, you can use a curveTool to analyze a plate and use it to drive a multiplier on an exposure node with a basic expression.

Originally Posted by darvinkmanwah: Also how do you select points in a point cloud ... thanks ...
You can find the vertex selection in the upper right corner of the viewer here:

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-deke
 
Old 09 September 2011   #3
Hey,

Thanks for the help on the curve tool ... I'll give it a whirl ... Just curious, what very of Nuke are you using? It doesn't look familiar ... 6.3? Also for an answer to the question I posted ... I had to select the Cameratracker and wait for a few seconds to see the points. If you don't wait for it and don't know about it, you won't know that you can see the points in 2D to be selected and then it would be visible in 3D. It took me a while to figure it out ....

I'll do a bit more reading on the curveTool. Thanks for the help ...
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Darvin K. Manwah - Matte Painter & Digital Compositor
Online Portfolio & Personal Blog
 
Old 09 September 2011   #4
Originally Posted by darvinkmanwah: Just curious, what very of Nuke are you using? It doesn't look familiar ... 6.3?
Yes, that menu is new in 6.3. Though that button did point selection as far back as 6.1.
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-deke
 
Old 10 October 2011   #5
Great, thanks, the point selection worked ... Also you have to have the camera tracker node selected to be able to see the points in 2D and when selected it turns yellow and it is then visible in 3D.

Also can you give a bit more info about the curveTool and how to analyse the plate ... thanks
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Darvin K. Manwah - Matte Painter & Digital Compositor
Online Portfolio & Personal Blog
 
Old 10 October 2011   #6
The curve tool analyzes the pixels in the shot and gives the max/min/average pixel values in a given area. You can then use those values as an expression to drive an exposure node(mult).
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-deke
 
Old 10 October 2011   #7
I'll have a punch at it and see where it goes ... I'll give another update with what I find from messing with it ... Thanks much ...
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Darvin K. Manwah - Matte Painter & Digital Compositor
Online Portfolio & Personal Blog
 
Old 10 October 2011   #8
Hmmm didn't really get very far with this, will try it tomorrow and see what I get ... Thanks ...
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Darvin K. Manwah - Matte Painter & Digital Compositor
Online Portfolio & Personal Blog
 
Old 10 October 2011   #9
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