Forgot to put in the Tree (compo help)

[Squareframe]

Hi all....I have been working on an animation fly through, and after my IM and LC were nicelly calculated and I pressed for the final render i realized that I forgot to put in a damm tree that is pretty important......now In my animation the camera does an areal fly through then moves inside the building and ends in this foyer were the big tree is. theres is a lot of glass around the building so you can see the tree from various angles.

 

My question is: How can I bring the tree on its on and get the shadows and reflection I need.

 

I have done mate shadows before for roads and outside trees but never for objects you can see through other objects and for reflections.

 

I dont really wanna render the whole thing with the tree again.....and i dont mind doing soem hard core compositing.....

[Kopeykin]

Render only sequences with tree and mix all stuff with composing software. You don't have even render whole render frame, just region. In those parts that don't need reflections you can render just tree only with alpha channel to speed up render.

[Squareframe]

Hi Kopeykin:

 

Thanks for your advice... I have actually thought of rendering region... but there are 2600 frames and in almost all of them you can see the tree thus I might have to cove a large area with the region....and move it constantly as the camera moves

 

also

How exactly do I make the building an alpha...?? and what about shadows

[Kopeykin]

Mabe it's kind of tricks but who can say we are wrong if we have good result. You could make some fast masks for necessery objects applying w/b mats and using them as alpha. Only you need same antialiasing. Shadows channel you can render separately as element. It's fast too.

[Nic H]

you could do it Kopeykins ways but thats a little longwinded imo, this should be quiet straightfoward:

 

select your whole scene except the tree

vray properties on right click menu

vray matte object ticked ( -1)

affect shadows and alpha ticked

 

render using the same saved GI solution

 

now comp it over the base, it should fit perfectly including the shadows.

the reflections might be problematic as you will be doubling them up in places if you have reflection at 1 in vray properties.

 

I reckon you could get away with having no reflection in your tree matte pass (reflection 0)

[Spooner04]

 

render using the same saved GI solution

 

 

 

Should he be rendering with add to current map instead of multiframe incremental?

 

Just want to clarify so he doesn't overlook something.

[Nic H]

hmm yes you are right, in that case just make a new precalcd imap.

[Spooner04]

What kind of machine are you working on? What settings are you using? If there are not any moving objects in the scene, (people,cars,etc.) an irradiance map shouldn't take more than a couple of hours to calculate.

 

What nicnic was saying might work, I think if you could "add to current map" and just take half a dozen shots in a circle around the tree it should add it to your current irr map and then you could render out your stills. But I think since all you've got out is the irr map then just redo it.

[Squareframe]

Thank you so much:

Kopeykin, nicnic, Spooner04,

 

select your whole scene except the tree

vray properties on right click menu

vray matte object ticked ( -1)

affect shadows and alpha ticked

 

I have been doing some test with the matte properties and I can get the shadows and alpha pretty well... so I will def, use this method....

 

My machine is quad core dou, 4gb ram..so its pretty fast....so doing the IM doesnt take that much time. I just didnt wanna renders the whole final animation again because of time constrains...

 

I will try some test with te reflection....this is the only worry I have still....

 

I'll post a final when is done!!!!