Transparent one Object with a other.

[Brian Jones]

this is what the Boole object is for, place the machine (it can be many parts inside a Null too) and the Cube in (as children) of the Boole. The default setting of the Boole (A subtract B) will do what you want.

[Thomas Pascavage]

sounds like some xpresso broham. try this out:

drag the case into the xpresso field.
drag the texture into the xpresso field
drag the components in there too, preferably grouped under a null.

in the texture field youll want to link up the transparency brightness and correlate it to the position of an axis of the case youre moving it in minus the position of the null grouping your components.

work out the math so that by the time the distance equals 0, transparency equals 100. use the range mapper.

now when the object is outside the case, the case will be opaque and as it moves into the case itll interpolate to complete transparency. if your only wanting a window, Id say restrict the texture to a polygon selection.

also if you don’t like rigs, you can manually animate the transparency

[Stefan Hinze]

Hey thanks for your replys guys!!

After i postet my question and was ready to go to sleep, i got aware that i did not post the whole settings to you.

There is a animation that shows the funktion, and therefore i use Dynamic-Body (RidgetBody Tag) and the emitted objects need some sort of object to keep them from falling.

How ever, i will use the Boolean.

I will dublicate the model, make one copy 100% transparent (to keep the emitted objekts) and the visible objekt will get the boolean so i can cut it in half (visualy).

I know, this way the computer will need to render the model 2 times … but i think the way i will make it is somehow save for me, beouse i know how to do the thinks i described.

IF SOMEONE KNOWS A OTHER/BETTER WAY — Keep it comming!!!

Sometimes it helps to get a little push from outside!
Thanks guys!

[Brian Jones]

that way would be simple enough if you just use Alpha on the invisible object (rather than Transparency). I don’t know what kind of a time hit that would be. There is a plugin that will do what you want – rBoole by David O’Reilly (not free) but you would have to know how to run it since there are several ways to use the plugin and only one does what you want – I just tested and it works though.
I would try your way first and if you don’t find the renders too long use that.

[Stefan Hinze]

thanks Biran,
ich think i will give it a try, the render was
1 sek of animation = 1h of render time
🙁

(take a step back, to see the bigger picture)