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losing Shadows in Post
show user profile  9krausec
I am trying to put text over an image in AE, but I am losing the shadows of the text..

I did a test with by just rendering out one frame.. I am using this method for the shadows in vray to try and mimic a Matt Shadow material-

Choose VRayMtlWrapper, change ‘Base material’ to ‘Standard’, enable ‘Matte surface’, change ‘Alpha contribution to’ -1.0.

Then enable ‘Shadows’ and double check if ‘Affect alpha’ is off.

This is applied to the plane below the text.

I tried rendering out the text in both PNG and OpenEXR (thought it might of changed something, but it did nothing.)

edit- The only work around (which I know isn't right), is to do 2 renders.. One with the environment not green, but the actual photo/video and one with the green environment on w/o the video environment. Then in AE layer the one without the video environment on top, the one with below that.. That way I could get the shadows and still have the ability to edit the text (color correct/ grain)... That would take twice as long rendering though and there has to be another way to do this w/o using mental ray, but vray....

Here is a video Jing to show what I am doing in AE, any help please!

- Portfolio-

read 436 times
1/28/2012 9:48:45 PM (last edit: 1/28/2012 9:56:27 PM)
show user profile  Kajico
9krausec, mind sharing the exr? Also what layers are being exported with the exr?

(\/) (°,,,°) (\/) Woop woop woop!

read 419 times
1/28/2012 10:40:36 PM (last edit: 1/28/2012 10:40:36 PM)
show user profile  9krausec
Problem solved (if you still wanna take a peak at the EXR i'll post it after the render is done)..

So here is what I ended up doing... The switch to "affect alpha" wasn't checked on the material being used for the "shadow plane", that was the problem.... (To avoid getting the rough (pretty transparent, but noticable), edges of the plane I put a radial opacity map on the plane to feather the falloff of the opacity a little.)

After switching the "affect alpha" on in the VrayMTLWrapper material being used I could then change the "Premultiplied - Matted with color" on and mix it to match the color of my environment (which I changed to white as opposed to that bright green).

So at the end of the day, no wonder the alpha was cutting out the shadows, because the settings told the material to not affect the alpha...

Like I said, I solved it, but if you want more information that I missed in this reply, please ask and I am willing to share. The OpenEXR did not have any layers with the exception of the alpha.


- Portfolio-

read 410 times
1/28/2012 11:11:11 PM (last edit: 1/28/2012 11:11:11 PM)
show user profile  Bolteon
are you sure it's there but just not that visible? it's easy to see a shadow on a solid color; very hard on an image...

-Marko Mandaric

read 409 times
1/28/2012 11:11:43 PM (last edit: 1/28/2012 11:11:43 PM)
show user profile  9krausec
yeah. In AE I created a solid layer and colored it white... put it directly below the text and toggled it on and off to double check the shadows were there or not.

this is what the final output will look like more or less..

- Portfolio-

read 402 times
1/28/2012 11:32:25 PM (last edit: 1/28/2012 11:34:39 PM)
show user profile  Kajico
Glad you solved it!

(\/) (°,,,°) (\/) Woop woop woop!

read 390 times
1/29/2012 12:32:34 AM (last edit: 1/29/2012 12:32:34 AM)
show user profile  Bolteon
now you just need to match the cg to the plate in terms of defocus, grain, compression, etc.

-Marko Mandaric

read 384 times
1/29/2012 1:30:36 AM (last edit: 1/29/2012 1:30:36 AM)
show user profile  9krausec
I have no clue how to do that.. : ) This is my first try. Any recommended tuts Bolts?

- Portfolio-

read 378 times
1/29/2012 4:16:52 AM (last edit: 1/29/2012 4:16:52 AM)
show user profile  Bolteon
think about it in a logical manner... (and you wont find tuts on this stuff; this isn't how to light a __________ 101... this is the upper end of what we do).

what is defocus, grain and compression.

defocus is just a lack of proper, you guessed it... focus or a downside to using a small sensor. you can mimic it by a simple blur in this case; look at how sharp your edges are compared to the plate.

grain is just colored noise in a certain size/pattern/density. again, think simple...

same goes with compression. in both instances. do a read up on how they work and it'll become apparent how to replicate them.

i also see a bit of chromatic abberation, and there's some need to down res your render... not only is it too sharp but it's pixel density isn't matching the plate.

-Marko Mandaric

read 356 times
1/29/2012 11:45:37 AM (last edit: 1/29/2012 11:46:25 AM)
show user profile  9krausec
ahh, I see...

Now here is what I know of to match the plate more so via AE..

Add grain

and perhaps some Lens Blur using a Generate Ramp as a Depth Map (for the 3d objects only, not the actual footage)..

anything you would suggest as well (I know it's not a simple as clicking a button, but I would need to balance all of these effects accordingly.

- Portfolio-

read 332 times
1/29/2012 7:24:03 PM (last edit: 1/29/2012 7:24:03 PM)
show user profile  Bolteon
if you wanna go for the brass ring; i'd say take that image that you have and build a small displacement map for the surface you're rendering on so you get shadows that interact with the snow that's on the table... it'll really tie it in.

start with the image; into photoshop, desaturate and pull curves on it till it's near what a displacement map should look like. then camera map per pixel the texture back onto the plane with your tracked camera and use the texture as a displacement for the object/plane you're rendering on.

-Marko Mandaric

read 327 times
1/29/2012 7:32:01 PM (last edit: 1/29/2012 7:32:01 PM)
show user profile  9krausec
I'll go that route with this one (more exciting than text)


- Portfolio-

read 322 times
1/29/2012 8:02:11 PM (last edit: 1/29/2012 8:02:11 PM)
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