Glass and shadows

Support Basics & Interface
1

Hi all,

I’m trying to learn how to use blender 2.32 to make glass look realistic, I could make an acceptable sphere of glass, but I cant make the shadow that it casts to look ok… it keeps looking like a shadow casted by an opaque sphere…
Can someone plz give me some tips here?

thanks in advance

these were made with the blender internal render:
http://tvtel.pt/jpcosta/blender/vidro1.jpg
http://tvtel.pt/jpcosta/blender/vidro2.jpg
http://tvtel.pt/jpcosta/blender/vidro3.jpg

I used this settings on the sphere:
Ray transp:
IOR: 1.15
Fresnel 0.7
Fact 3.2

2

Enable TraShadow for the object recieving the shadow.

Martin

3

it also might help to turn on OSA in the rendering menu…

4

I’ve enabled TraShadow to the plane receiving the sphere shadow and i’ve enabled OSA 16, i’ve been playing arround with diferent options but I couldnt get any result… The shadow of the sphere keeps looking opaque without looking ‘glassy’!
I would really appreciate some orientation here… I’ve searched all around but I cant find any tutorial or documentation on this subject :frowning:

Thanks

PS: I heard about a .blend file repository with lots of examples files, but I dont know if such thing exists? Anyone knows something about this?

5

What kind of lamp are you using? I think you need to use an area light, with Ray Shadows turned on in the light settings. :slight_smile:

6

Yea I am having the same problem. I have search for everything i can think of, shadows, glass, glass and shadows, cant find it any where. If someone could just clarify how you make the shadows for the glass I would appreciate it.

7

I’m no expert, but I think I remembered reading that Alpha should be less than 1. So is your glass object’s alpha value less than 1?

-Roofoo

8

You must also enable the lamp for raytrace shadows in the Lamp Materials buttons. Here’s a .blend file you can use that has this already set up. Take a look at the materials for the background picture and for each of the lights. Here’s a frame from the animation:

http://stoneacres.home.comcast.net/pictures/Champagne_Bottle_Final.jpg

Please note that I will be removing these links shortly to reclaim website space.

Hope this helps.

9

OK, I’m no expert here, but I was playing with the same thing today. Whatever the shadow is falling on, i.e, plane or other object, click the
TraSha button on in the material editor. I guess it’s supposed to make the material receive transparent shadows.

Mike