-
Transparency issues…
I’m a little confused as to how transparent objects work with reflective objects…
I have a plane with a reflective material, serving as the floor.
i have another plane which has a texture with an alpha applied to it. This plane is perpendicular to the “floor” plane, and the texture is simply a photo of a person with an alpha channel.
Behind the “person” plane is yet another plane, serving as a wall.
My problem is that the image of the wall plane is being reflected onto the floor by the “person” reflection.
This sounds confusing, so i’ve attached a picture…
You can see the checkered wall (behind the man) is being reflected on the floor……and the reflection occupies the same area in which the transparency of the person occupies.
Any ideas how to remedy this?
Thanks!
-Dean
-
18 Replies
-
The compositing>exclusion function is a bit confusing. I’m guessing that in this case you have compositing tags on the wall planes that are excluding the floor plane? That’s correct as far as it goes, but what it’s not doing is exluding the rear wall plane that’s being refracted through the tranparency of the alpha-mapped plane.
To correct that you need to add the alpha-mapped plane to your exclusion lists.
-
Try going to the Objects window and clicking on the material tag that you have applied to the plane with the man. Change the projection (down in the Attributes tab) from UVW to Frontal.
-
Hi Adam,
Thanks for the response…
I have simply unchecked the “seen by reflections” box in the compositing tags for the walls.
I tried your suggestion of excluding the alpha “man” plane……….this works, but i lose his reflection as well.
I’d like to keep his reflection on the ground, and get rid of only the wall refraction…
Any ideas?
Thanks man
-
Hey Sebastian,
Thanks for the advice.
I think you’re right about screwing around with the ray depth….
This works if i take it down from the default 15, to 2.
My problem now is that when i add other objects which have alphas……the renderer does not render their alphas…it instead renders the alpha as black.
If i bump up the ray depth to 3, then the alphas of my new objects work….but i end up with my orignal problem of having that back wall image appearing on my floor once again.
Any suggestions?
Thanks!
-
Thanks Bill,
I tried that, but it doesn’t seem to make a difference….for me.
-
The method I described works — maybe I didn’t describe it very well. Here’s an example scene: 2630_exclusiontags.zip
-
Hey Adam,
Thanks so much for taking the time to put the scene together….very kind.
I guess it must be an issue with my render settings, because when i load your scene and render…i get this (see attached photo).
What do you think?
-Dean
-
do you have your Ray Depth set to 0?
-
No….Ray Depth is set to the default, 15.
-
That is very odd. I can’t think what the problem might be. Might be time to contact Maxon tech support.
Reply to this Discussion! Login or Sign Up