Leafs Backlit

[40th]

When i found this 'effect' and tried it for myself, i thought why not share it?

We all know that leafs aren't opaque.
Real leaf example


Open vray material editor>select leaf material>Options> uncheck Double-sided.



That's it! now render and see the difference.
Examples below.

[thomthom]

Re: Leafs Backlit

That's all? No need to change opacity?

[40th]

Re: Leafs Backlit

Not needed, the result you see is done only with Double-Sided option turned off.

[thomthom]

Re: Leafs Backlit

Interesting. So I suppose all material will behave like that if two-sided is of.
I had thought that the two sided was suppose to be on when you wanted to simulate thin material. Serves me right for just skimming through the manual instead of actually reading.

[40th]

Re: Leafs Backlit

Yes, all materials. It fits thin paper material as well.
Imo the manual good for starters, but for more complex/sophisticated there's much more information left out. This is why we should help each other to learn more.

[thomthom]

Re: Leafs Backlit

Translucent leafs and paper was one of the things on my to-test list. You post has prompted me to give a go this weekend. I wanna play!

[thomthom]

Re: Leafs Backlit

Can you share the scene?
I can't reproduce this.
What is the light source? Sun?
The only difference I see with double sided on or off is whether the shadows hits the leafs below the top leafs.

Only way I could make the leaf translucent was to use the diffuse map as opacity map, but that just made things look like it was photoshopped layer on top of each other.

[40th]

Re: Leafs Backlit

Light source is Sun only.
No opacity needed, the Double-Sided option allows to see the shadows 'hitting' a surface while looking at the backside of the surface. I hope that my explanation understandable.

Link to Scene File rapidshare.com/files/157436015/Leafs.rar

[thomthom]

Re: Leafs Backlit

Thanks for uploading the scene. I'll have to wait to try it out until I get to the office where I'm still using the original release. Here at home I use the SR1 and the scene acts completely different.

[pacha]

Re: Leafs Backlit

Dear 40th,

Thank you for sharing the idea and the model.
This white spot in the background which's looking something like the sun; how could you do it????

Regards.

[40th]

Re: Leafs Backlit

Dear 40th,

Thank you for sharing the idea and the model.
This white spot in the background which's looking something like the sun; how could you do it????

Regards.

You're welcome
And the white spot is a SketckUp sun.

[pacha]

Re: Leafs Backlit

Hi 40th,

Thanks for your reply.
When I referred to your model, I saw that the angle at which the seen was set to show the SU sun was very queer.

Can you please explain the way to show the Su sun???

Regards,

[40th]

Re: Leafs Backlit

Hi 40th,

Thanks for your reply.
When I referred to your model, I saw that the angle at which the seen was set to show the SU sun was very queer.

Can you please explain the way to show the Su sun???

Regards,

Hey pacha,

I had default settings for the sun, with "Override Sun's parameters" checked.
For orientation, i turn on the SU shadows and according to them aimed the camera.
As for the camera location in the scene, it's located close to leafs for zooming.

So for seeing the sun directly in the sky just aim your camera according to the SU Sun's shadows.

[artchung]

Re: Leafs Backlit

that is a very good trick. thanks for sharing!!! u're great!!