[solved] Does a glass material in corona behave like physical glass?

[Jpjapers]

Someone on Max Forums posted a question about simulating lightguides (solid glass to change the direction of a beam of light)
I thought it sounded like something corona might be capable of after remembering the thread from a while back where someone had built actual lenses that worked infront of the max camera and i thought id give it a go. However i tried this and the light (rectangle light with directionality set to 1 and tried with 0) just disappears and doesnt shine out of the other side of the glass. is there anything i need to do to get it to work properly? Caustics are enabled but the light intensity through a solid block of glass is basically 0.

Thanks
Jack

EDIT: Sorry I should have put this in the help forums.Ive attached an image from the vfb. The black dot on one side of the block is a light set to the highest possible intensity of 999999 and as you can see nothing is coming through the other side.

[Ondra]

yes, it works ;)

[Jpjapers]

Hmmmmm. Have you done anything special with your setup? and does it work with a rectangular light?

[Ondra]

it will work rectangular light, and only thing i did was set MSI to 0 and enabled caustics

[Jpjapers]

Sample intensity. thank you!!