rendering w/ clipping plane

[ean]

When I'm using a clipping plane in rhino 4 the v-ray (30-day evaluation version) renderings still show the whole model, whereas the rhino renderer shows the 'cut' version (like I want it to be shown). Is there some setting in v-ray that I've missed that you need to enable when using a clipping plane?

Thanks,

ean

[joe_b]

Re: rendering w/ clipping plane

I don't believe that we have a way to utilize clipping planes at the moment. I'll add that to our internal wishlist though

[dalomar_cg]

Re: rendering w/ clipping plane

Since were talking about clipping planes, I'd like to voice my wish... it always annoyed me with clipping planes in max, that when geometry was clipped there was no face on the clipped end. This lead to seeing the inside of walls and floors an a bunch of photoshop or extra modeling/rendering work (maybe I set them up wrong). It would be absolutely awesome if you could choose to have the clipped end either render like the materials its clipping or be able to associate one material to the whole clipped end. Anything to prevent that stupid open geometry look.

[Micha_cg]

Re: rendering w/ clipping plane

For me for look-in-closed-rooms is important to get a "invisible to camera" option. So, we could look through massive walls (closed polysurfaces). The current solution of two side material with transparent backside is good for thin surface walls only. A good start in the right direction. Damien, interesting, I thought clipping planes could be a great method, but the look-inside-wall seems to be a hard problem. So, "invisible to camera" seems to be the best solution.

Pro/Desktop, an old sister software of Pro/Engineer, support some great modelling feature. One nice view feature is, that the user can temporary enable a cuted view like at the attached image. Cuted closed objects are shown closed again. But this feature would be something for the McNeel team - an anhanced clipping plane feature.

[dalomar_cg]

Re: rendering w/ clipping plane

What the whole issue actually stems from is the different geometry engines in the different programs. Most programs use representative geometry, which is the equivalent of building a box by using planes for all the sides. Other programs (mostly engineering related; Catia, Solidworks, and ProEngineer) use solid geometry engines, which mean that a box is literally thought of as a solid chunk of material.

The programs with solid engines are usually better with things like fillets, booleans, intersections, compound objects, and other things that most representative engines have trouble with. For the clipping planes, in solid engines where ever you slice the model there will of course be "material" there because the program things of the geometry as solid. Since the representative geometry is only describing the outer faces, slicing through the middle produces a nice big opening.

To me the invisible to the camera thing is really a must whether this clipping plane thing works out or not.

[skysurfer]

Re: rendering w/ clipping plane

For JoeB: Renderign of clipping plane will be a great feature!
I think it's possible to render the cutted object with clipping plane because Flamingo Beta2 did. (I don't know how, but maybe it's somethings in the RDK?).

For Dalomar: Maybe if the clipping rendering could work, will possible to find the intersection of the clipping with the object (for sure) and build a map or a channel were store this edge.
If will be possible find the countor of the cutting edge and creating a map could be possible to fill with some feature or save it for filling it in a photoshop post work.

bye

[dalomar_cg]

Re: rendering w/ clipping plane

I know its possible, i was just explaining why a program like pro engineer supports it out of the box. In the past I have sliced up models and created those faces, so its not that rhino can't do it.

[heavyweather]

Re: rendering w/ clipping plane

How about vray for Sketchup? are clipping planes rendered there?

[dalomar_cg]

Re: rendering w/ clipping plane

No they aren't supported in sketchup either...the thing about clipping planes is that its not that the geometry is not there, is just not displayed. And when we load the geometry to render the scene, its still all there, so we've got to find a way to grab the info from the clipping plane and figure out what info we need and what info we don't. I'm sure Joe can get it working, its just a matter of whether its going to be a simple thing or a hard thing. Only time will tell...Only time will tell.

[joe_b]

Re: rendering w/ clipping plane

Sketchup has "Sections" that are kinda like clipping planes. But no- we don't support them yet