By richardfollett
#280399
I am sorry if you think this has already been covered but I still dont get it!

I want to create my final render on a pure white background with shadow. So I create an alpha channel which I understand and I also create the shadow channel, now I want to merge them so end result looks like one of Hyltom renderers ;)

I am just trying to understand the workflow..

I know this is more a photoshop issue but I am sure someone understands what I am trying to achieve..

Thanks

Rich
Image
By bjorn.syse
#280414
Well, in short, in photoshop:

1. Use the alpha-channel to "Mask away" the background from your render. So that you get a transparent background. You can use a specific actions made by Tom for this (available on the think.maxwelllrender.com site)

2. Now, place a layer beneath the render with transparent render, and fill it with white.

3. Third, use the shadow pass and place that on a third layer between the two first layers and set it's blending mode to "Multiply"

Hope that helps

- Björn
By richardfollett
#280418
Thanks Bjorn,
Im loving that Action from Tom.

Cheers

Rich
By bjorn.syse
#280425
You're welcome. Yes that actions really is neat! How did it turn out?

- Björn
By richardfollett
#286698
Sorry to bring this up again but im lost.
I am trying to create a shadow channel but it is all white? Now it not all white to start with as I watch the file being created. Simple test with ball on a floor. I have set the floor material to except shadows. Any clues?

Thanks

Rich

So it look like this for about 1 SL then all white????
Image
User avatar
By tom
#286735
How does the light source look like?
User avatar
By tom
#286775
OK, could you please send me the scene? :)
By richardfollett
#286777
So I have this : Render
Image

And this Alpha :
Image

So why is my shadow Pass not working??

Thanks

Rich
User avatar
By tom
#286781
I confirm this is a bug when shadow channel is used with skydome. But at least there's an equivalent workaround. Please download white.hdr from the link below and replace skydome with Image Based Lighting.

http://www.divshare.com/download/5997654-571

Here's the correct result:
Image
By richardfollett
#286782
Thank you Tom,
Sorry I was not aware there was a bug with the Skydome & Shadow pass.

Regards

Richard
User avatar
By tom
#286784
Me neither :) Thanks for reporting it! Let me know if the workaround is acceptable.
By richardfollett
#286789
Thanks tom,
look ok but in photoshop blending layers I get white at bottom, this might be me doing something stupid. I have set blending mode to multiply on both layers. This correct?

Ta

Image
User avatar
By tom
#286796
Can you replace "Remove Black Matte" with "Defringe 1 pix" (Layer / Matting / Defringe) in the Photoshop Action? Maybe there's a problem with generation of alpha and we'll check this, too.
User avatar
By tennet
#287640
Hi,

I'm using Cinema and Maxwell. Is it possible to render the RGB, shadow and the alpha channel in one go? Or do you always need to render alpha and shadows separetely?

Also, if I use an HDR environment for lighting and I need the shadow channel rendered - is it correct to create an image emitter with the HDR-map and then project this image emitter onto a sphere, instead of the sky object within Cinema? How big should I make this sphere to simulate a sky object in that case? If I'm totally wrong, please point me in the right direction. :?

I'm pretty new to Maxwell, hope I make sense.. Thanks!

// tennet
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