matte setting not working...help!

Forums: matte setting not working...help!
Newtek Lightwave 3D (exporter developed by holocube, Integrated Plugin developed by juanjgon)

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matte setting not working...help!

Postby electric_eric » Sun Apr 16, 2017 9:34 am

electric_eric Sun Apr 16, 2017 9:34 am
Hi,

Often I use a ground plane with diffuse material set to 'matte' to create a shadow catcher effect.

With the latest version of the plugin the matte function no longer acts as a shadow catcher. I've checked my old scenes that use this method and they all appear to be broken.

Please help!

Thanks
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Re: matte setting not working...help!

Postby juanjgon » Mon Apr 17, 2017 10:41 am

juanjgon Mon Apr 17, 2017 10:41 am
Hi,

I'm testing this feature here and it seems to work fine. Anybody else has problems with the diffuse material matte option?

If you want to share a scene with this problem, I could test it here to see if I can find the problem.

Thanks,
-Juanjo
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Re: matte setting not working...help!

Postby Godstrike » Tue Jun 05, 2018 10:30 am

Godstrike Tue Jun 05, 2018 10:30 am
Hi Juanjo,

I'm using the latest build and want to use a matte object to occlude the alpha channel.

I apply it to an object, but a ghost of the object remains in the alpha (see below).

I thought the matte object would leave no trace in the alpha channel, or have I got it wrong?

Thanks,
Carlo
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Re: matte setting not working...help!

Postby Godstrike » Tue Jun 05, 2018 11:09 am

Godstrike Tue Jun 05, 2018 11:09 am
---------------------------

....but when I activate 'Alpha Shadows' in the Kernel (PT) the ghosting is reduced, but not eliminated.
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ghost+alpha shadows.JPG
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Re: matte setting not working...help!

Postby juanjgon » Tue Jun 05, 2018 9:55 pm

juanjgon Tue Jun 05, 2018 9:55 pm
Are you talking about the "Matte" option available in the diffuse material? Probably this parameter should have been renamed as "Shadow catcher" a long time ago, because this is how it works.

To fully control the object visibility including the alpha channel, you should try to work using render layers, as you can see in the docs:
https://docs.otoy.com/Lightwave3DH/Ligh ... Layers.htm

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Re: matte setting not working...help!

Postby Godstrike » Wed Jun 06, 2018 11:16 am

Godstrike Wed Jun 06, 2018 11:16 am
Yes, exactly.

For comping, it would be helluva useful to have a switch in the Diffuse material that one could switch on and the object would be 'cut' out of the alpha channel.

The matte object switch is 99% there, it's a far faster work-flow than going into layers.
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