Beauty canvas rendering question

Aala

Basically, when you render a beauty canvas and only want to render a single object, you create a node list with that object in it and select that list.

But if that object is transparent, like a glass bowl for example, it will render everything direclty behind it too. Normally this makes sense because if you want to combine different nodes later on in a photo editor like photoshop, you would want to have the distortions that the glass behind the scene of course.

My question is if it's possible to turn this off? So all I would want is for the canvas to render the glass only and leave everything behind transparent.

Also, is there a way to render only the subsurface scattering part of an image?

dijitul

Can you turn off the objects behind it by unchecking their Visible setting?  Not sure about the SSS canvas.

evilded777

Aala said:

Basically, when you render a beauty canvas and only want to render a single object, you create a node list with that object in it and select that list.

But if that object is transparent, like a glass bowl for example, it will render everything direclty behind it too. Normally this makes sense because if you want to combine different nodes later on in a photo editor like photoshop, you would want to have the distortions that the glass behind the scene of course.

My question is if it's possible to turn this off? So all I would want is for the canvas to render the glass only and leave everything behind transparent.

Also, is there a way to render only the subsurface scattering part of an image?

I haven't done much of this when working with canvases, I tend to focus on light passes.  So  I am no help with the first question, but as to the second.. there may be an LPE (light path expression) for that, but I don't think there is a canvas set up for it (canvases really are just a simple gui for light path expressions).

Aala

dijitul said:

Can you turn off the objects behind it by unchecking their Visible setting?  Not sure about the SSS canvas.

Would't that alter the lighting on he object?

My ultimate goal is very simple, I only want to render a fog box, so that I can take the fog in photoshop or something similar and denoise it, then add it to the render. That way I could have a simple, fast way of adding atmosphere to a render with godrays included. The problem is that as soon as I place the fog box infront of the camera, everything behind it gets rendered.

 

evilded777 said:

Aala said:

Basically, when you render a beauty canvas and only want to render a single object, you create a node list with that object in it and select that list.

But if that object is transparent, like a glass bowl for example, it will render everything direclty behind it too. Normally this makes sense because if you want to combine different nodes later on in a photo editor like photoshop, you would want to have the distortions that the glass behind the scene of course.

My question is if it's possible to turn this off? So all I would want is for the canvas to render the glass only and leave everything behind transparent.

Also, is there a way to render only the subsurface scattering part of an image?

I haven't done much of this when working with canvases, I tend to focus on light passes.  So  I am no help with the first question, but as to the second.. there may be an LPE (light path expression) for that, but I don't think there is a canvas set up for it (canvases really are just a simple gui for light path expressions).

Hmmm, I may have to look into that. Thank you!

dijitul

Aala said:

dijitul said:

Can you turn off the objects behind it by unchecking their Visible setting?  Not sure about the SSS canvas.

Would't that alter the lighting on he object?

I wouldn't know -- I don't have any idea how your scene is set up.  We're all just tossing suggestions your way.  

Another idea is to fake it with a depth canvas since you're using Photoshop anyway, but again I have no idea about your scene.

Aala

dijitul said:

Aala said:

dijitul said:

Can you turn off the objects behind it by unchecking their Visible setting?  Not sure about the SSS canvas.

Would't that alter the lighting on he object?

I wouldn't know -- I don't have any idea how your scene is set up.  We're all just tossing suggestions your way.  

Another idea is to fake it with a depth canvas since you're using Photoshop anyway, but again I have no idea about your scene.

I can fake it with the Depth Canvas, but you'd have to fake the godrays manually too. As for my scene, it's simply an interior (I was testing it out on Stonemason's Loft for example), so if I hide the walls and everything behind, I lose the godrays.