OTOY Forums

Hi,

I want to create a boolean style clipping effect for an object reveal. Something like a building being revealed from the ground up to give the impression that it is being built over time.

A simple example of the kind of thing I'm trying to do here: http://www.youtube.com/watch?v=azM5_U4FzLY

Is there any such thing available to me in octane?

* update: I've managed to use a mask image map linked to a null to reveal the object but need to somehow create the cap to give the impression of it being a solid object. Is there any way of connecting the spot info node (polygon side) to my octane material?

Thanks,
Simon

Isnt the cap faked? I seem to remember that video a long time ago.

You can do it easily if you want it to come to/from the camera. You just use the clip distance.

Yeah the cap is faked but I just wondered if its possible to get something similar in octane.

The camera clipping is a nice idea but I need to have the camera flying around a building while it builds from the ground up, so that's not really an option for me.

Spent all night trying to find a solution with no luck so far

Your best chance to get this effect is to have an UV map in the object along the animation axis, a wipe texture map and animate the "Translate U" image texture parameter. Try the attached scene to see how it works, you only need to scrub to see the effect. Open the object in the modeler to see the UV map, that in this object is only a planar Z projection.

-Juanjo

If you have a black image with a white border, and do the same, but use the projection node. Have the size be the size of the object, and the position using channel follower following the position of a separate cap object. You can get this..

[youtube]http://www.youtube.com/watch?v=x8MpsluG8Ro&feature=youtu.be[/youtube]

It's very cumbersome, and I'm not sure how workable it would be for a big project with lots of objects. Migt be better just accepting you'll see inside the objectss

Thanks for the replies guys.

I want to avoid making custom 'cap' geometry as some of the shapes I'm dealing with change as the clipping mask moves through them. Windows and doors etc may prove to be extremely time consuming to set up using this method.

You're probably right gorden, I'll have to leave the polys open which wont look great

Could have have internal geometry that is very slightly inset from the outside geometry. Then you could have the surface be very slightly emissive. Just enough to not show shadows?

Thats not a bad idea actually. Will give that a shot.

Thanks

That worked!!

This is certainly enough to look like its a solid object and much better than seeing inside the geometry.

Many thanks for that

electric_eric wrote:That worked!!

Hi! Trying do the same on cinema4d integration. But evidently i miss something. Can You explain the logic of this effect application?