Blackmagic Forum

I have a logo made in cin 4d23. The spot lights look terrible. anyone help with this?

You might be better posting this on a Cin 4d 23 forum (whatever that is)

I had the same thought as Dave. This seems like a question for Maxon.

I assume you are overlaying this in Edit/Cut. Have you checked the settings in the Inspector's Composite tab? And did you make the appropriate output settings in C4D? I think terms like pre-multiplied (and non-premultiplied), additive/subtractive, etc might be useful on the C4D side. This is basic 3D rendering/compositing stuff. There may also be a problem with the file format you exported to, which may not support a full (grayscale) alpha channel.

As a quick workaround -- but you need to figure out how to render/import properly in the long run -- you could use the Inspector's Composite tab to set Screen or Add mode and probably get something more like what your ultimate goal is.

wfolta wrote:you could use the Inspector's Composite tab to set Screen or Add mode and probably get something more like what your ultimate goal is.

^ this

Hendrik Proosa wrote:

wfolta wrote:you could use the Inspector's Composite tab to set Screen or Add mode and probably get something more like what your ultimate goal is.

^ this

The problem is that Screen/Add (and most other transfer modes) will do the same thing whether you have an alpha channel or not. So it's not really the proper solution if you intend to have alpha channels. And it only works in this case because they're essentially generating lens flares, which are additive in nature. Won't work for an actual object.

For actual object first thing is to check if alpha channel is proper and RGB data is as expected, premulted and all. If it still fails, it is an error in alpha handling in Resolve.

Which format did you use to export from C4D?
Did you set the alpha to straight?

One more thing: a spot light in C4D itself is no object to render. What did you use for it as a practical?

It works perfectly fine for me: