Azeiku opened this issue on Jul 24, 2006 · 5 posts
Azeiku posted Mon, 24 July 2006 at 10:27 AM
First of all, I'm pretty much a newbie with Carrara so please bear with me. I'm having difficulties with the Anything Glows and getting effect I want. If anyone is good with Carrara and they can help me out that would be wonderful!
I have a room that I'm making. In the room I want the ceiling to glow so I'm putting a recessed area between the wall and the roof. I'm taking those polygons and setting them with Anything Glows. But you can see here that I'm getting a weird dark line up the ceiling (dome type ceiling) Instead of having the whole thing glow. I used a texture that has glow in the shader also but I tried that without and it still doesn't seem to work.
Here is what it looks like without the glow in the shader but with Anything Glows turned on. I pointed with red arrows and drew a green circle around the dark area that I don't understand why it is there.
Here it is in the Assemble room of Carrara. I pointed to the edge with red arrows. This is the same edge that is under the green circle in the picture above.
Here it is in Hexagon (where I modelled it.) This image shows the model so you can see what I'm doing with polys. I hide part of the ceiling so you could see the polygons that I set to glow (which I circled in red.) There is nothing there to cause the dark edge as you can see.
This last picture is with a glow shader on the polys that I set to Anything Glows. Also, it's a little further out view. You can see where the yellow gradiant starts is from the glow shader and the dark area that it is in. Driving me CRAZY!!
The only thing I could think of is that I do have indirect lighting turned on and this could be the shadow from the light bouncing back up from the floor. If that is the case, how do I eliminate that light or test that?
Thanks for any help you can offer.
Azeiku
nomuse posted Mon, 24 July 2006 at 3:10 PM
Actually, that last pic looks more like a light leak. Are your edges welded? In any case, try kicking up lighting accuracy and object accuracy, even tick the "take more time to do edges" box (whatever that one is called). Basically, the lighting calculation is generalizing a bit too much and thus it doesn't quite realize it can't go there. Increasing the accuracy of the calculation will likely clear it up.
Azeiku posted Mon, 24 July 2006 at 7:50 PM
Thanks, for your reply. The Fire Tray thing that I setting to glow and putting the Anything Glows (AG) on is a seperate item in the scene than the ceiling and wall. But they do touch. I've been welding them all together again to move them.. then right before I export from Hex2 to .obj to get it into Carrara I extract those faces. Is this the wrong way to do it?
I'm going to test increasing the lighting accuracy and object accuracy. I have no clue where to do it but I'm looking now!! ;-)
Thanks!
Azeiku
Azeiku posted Tue, 25 July 2006 at 11:00 AM
Thanks for your help. It didn't directly help me but indirectly it'll make my renders look a ton better! Thanks a bunch!
As for the problem I was having... I was playing around with it last night and finally figured it out. There is a setting in the Anything Glow properties for the offset height or something like that. I'm not on my computer with Carrara on it so I can't look it up. It's at the bottom of the list of stuff and there is also a minimum height or something like that too. Both are set to 0.25 inches as default and that was too high for me. I had to shrink it to 0 inches and then I no longer have the issue! Yahoo!!
Here's a screen shot of my room without the issue. This is just a start.. no textures exist yet in my scene.. I wanted to verify that I could get the lighting that I wanted before I took the time to texture things.
Thanks again!
Azeiku
MarkBremmer posted Tue, 25 July 2006 at 2:36 PM
Glad you figured that one out! I'd been meaning to give it a look but hadn't gotten around to it yet. Mark