pane of glass

V-Ray V-Ray for 3ds Max V-Ray for 3ds Max :: General
1

hi there.

how could i get real panes of glass?? i try whit vray mat whith reflect on white, and whit hdri for the reflections, but i can´t get good reflections on flat surfaces. :shock: what have i do?

thank you.

2

Try to use a black color on the diffuse slot; white on reflection with fresnel checked; refraction white; fog tint with a very light color; check reflect on back side and uncheck double sided.

Gonçalo

3

thank Gonzalo i will try :stuck_out_tongue: [/code]

4

the panels i whant are for the out side of a building…i whan the mirror efect.. :shock:

5

for the mirror effect put a falloff map in the reflect slot of the vray mat and then adjust the falloff how you like

6

:smile: thank you. i will try. them tell you. :wink:

7

Why uncheck double sided?

8

Because it does nothing to refraction!

Gonçalo

9

Hu? I thought that with no double sided material the refracted ray will bend forever because it never meets the backside of the object?

10

I thought that too until Vlado says that it doesnt, and I belive him. :slight_smile:

From the manual,

Double-sided - this option specifies whether VRay to assume all geometry faces as double-sided.

Reflect on back side - this checkbox forces VRay to trace reflections always (even on back sides of the faces).

Gonçalo

11

Hi, if this ‘pane’ is a plane without thickness I understand your comment. I did some tests on a simple glass model and noticed some interesting stuff:

double sided ON, reflect on back OFF:

double sided ON, reflect on back ON:

double sided OFF, reflect on back OFF:

double sided OFF, reflect on back ON:

Note the differences in rendertime and differences in the actual look…

12

Hi flipside, :slight_smile:

Thanks for the tests they are really helpful, however I can note the differences in rendertime but its difficult to see the results on the images, can you post a biger ones?

Gonçalo

13

Flipside,

Can you post your scene…

14

Sorry, demo version… I didn’t save anything!

But I can tell you (or just download them and view them in acdsee or something to note the difference).

There is absolutely NO difference in look between render [reflect on back=off & double sided=off] and [reflect on back=off & double sided=on]

There is a difference if you set reflect on back on or off, but also small. Here and there some more reflections appear.

But there is also some difference between [reflect on back=on & double sided=on] and [reflect on back=off & double sided=on]

Hope you understand me…

But don’t ask me what conclusion to pull out of this all! :slight_smile:

15

Well, here you can see some difference :slight_smile:

Reflect on back side on and Double sided off

Reflect on back off and Double sided off

Exacly the same settings on the glass material and light the only difference are the mention options.

Gonçalo

16

Wow that’s a great glass material and some great rendertimes! (my pc is only single p3-800Mhz, what do you have?)

Here is my scene if anyone still cares (i remade it…):
http://users.pandora.be/stor1/vray/glas\_test\_01.zip

Note it is made with demo version, so you’ll have to set all options again.

Goncalo care to share your glass settings? Which environment is around it?

thanks

17

Hey did you create these darker regions in the glass with the fog option? I’m testing with it, I didn’t know what it did, and still wonder what the exact purpose of it is. Is it related to the translucent options (which by the way I don’t understand at all)?

flipside

18

The glass settings are exactly what Ive discribed on the top of this post! :slight_smile: No secrets at all, I ve use caustics, a HRDI map for reflections and of couse GI. Just that… :slight_smile:

Gonçalo

19

ok thanks!