RPTrees and vRay

dylan

Question: I'm having trouble getting anything respectable looking out of my RP Trees when I render using sketchup. I think I understand how to improve the resolution for the trees, but my real issue is with the alpha masking--I'm getting nasty black areas around my trees. I think this has something to do with how it is masked or something. What do you recommend for the best quality images using RPtreemaker with vray for sketchup?

I don't understand where this question is from?
The thread starts directly with this quote.
Is it copied from another area or another site?

Al Hart

@unknownuser said:

I don't understand where this question is from?
The thread starts directly with this quote.
Is it copied from another area or another site?

Yes - we have a Q/A form on our web site. When people submit a question I often place the question and the response on the forum so that others can learn from the response and offer suggestions.

By pointing people to the SUC Forum I hope I am increasing awareness of the forum.

wahoowetzel

Another quick question regarding using the RPTrees with VfSU. The components appear to be face me components, but when I render in vray, they appear as 2D images that do NOT face the camera. Is there any fix for this that will allow the trees to face the camera when I render?

Al Hart

Does VRay process other face me components properly?

If so, we will have to see why the trees don't work properly.

If not - perhaps someone has a script to "freeze" face me components so they face the current camera, and can be used with Vray properly???

wahoowetzel

I just tested that out with Yang, and when I render in any direction he does face the camera.

Not sure if there is a work around, but would certainly be worth looking into. I'd be very interested in finding a solution to this in the near future for something I'm working on, so I'll be checking in.

Gaieus

Are the trees in the components image entities in SU? If so, explode them to be real geometry and try that way.

Al Hart

@gaieus said:

Are the trees in the components image entities in SU? If so, explode them to be real geometry and try that way.

If Gai's idea works, let me know and we can create the Components so that they work better.

You might also edit Yang, by adding an Image (not a face) to the component, and see if the image fails there as well. (This will see if images work properly in face me components for Vray)

Also, I believe it you turn on the shadow mask, on the 2nd "Place Tree Dialog", we make faces rather than images. We did this, because Podium required a face rather than an image. The rectangular mask may give you what you need. (The other masks create shadows in SketchUp as well)

Here is an earlier post on this subject:

@unknownuser said:

Post by EarthMover on Sun Nov 23, 2008 9:04 pm

Prior to rendering in Vray, I had to explode the Faceme component twice, then return it to a faceme component. I had to generate a transparency/alpha/clipmap (I use Deep Exploration)to plug into the transparency slot in Vray. This worked fine and the trees rendered well. The process is a bit of a pain, but who can complain about such nice trees for free!

Gaieus

Well, if he "had to explode the Faceme component twice...", could it mean that one was exploding the component and the other was exploding the image (to geometry)?

Well, I do not use Vray so anyone who does and knows the answer will hopefully chime in eventually.

thomthom

That's another issue in the current VfSU - it doesn't render Image elements. But, that is also something that is improved in the upcoming version.

So, in the current version, if the trees are Image elements:

Explode the Image elements
Extract the alpha channel into a separate grayscale image and load it into the transparency slot in the diffuse channel of that VfSU material.

In the upcoming version you'll only need to tick of a checkbox to make it read the embedded alphachannel.

wahoowetzel

So in the new vray for sketchup, where is the option to recognize the alpha transparency?

thomthom

In the diffuse layer: tick the "Use color texture for transparency" checkbox.

Gaieus

Although I do not use V-ray myself, this is a great, new feature IMO. There are so many, good resources with semi-transparent images and now V-ray users do not need to suffer with creating those clipmaps for their entourage any more!

thomthom

Yes - I've already started to use this feature!

Al Hart

@unknownuser said:

Question: I have used the RpTreeMaker to make some trees but when I use the option to create the Vray Alpha i get no results.

And if it saved an alpha - where does it get saved...

Or - maybe I dont know how to get the trees to render good (without a black outlind border around the tree)the holes that should be see thru but they are not, they have black blocking them.

Now I can use photoshop to clear that black out but to save it as a new tree pic makes it square again so trying to create one for Vray seems not to be working.

Maybe you can explain it a little bit to me.

The Vray clipmask is saved on a "dummy" material on SketchUp. You would need to click on the material and choose "Export Texture Image"

It is also stored in your temporary folder in a subfolder called RPS_TreeMaker_Images