moving clouds reflection in window

[Anonymous]

what’s the best way to create cmoving clouds refelection on glass building?

I don’t think rendering will be the fastes method so I guess I could achieve it somehow with comp software. I want to make clouds move in this picture:

[kalthans]

are you looking for general tips or tips pertaining to a specific application/system (flame, shake, etc)?

i assume the image is a still

you will need to do some extensive rotoscoping and do a complete sky replacement. the only thing you can salvage from the original image is the frames of the windows (the borders)…everything else must go. replace the sky with a new one (timelapse maybe?) and use that same clip as the reflection element. some distortion/displacement will be in order for the reflection to make it look like it is passing over the uneven surfaces of the glass windows.

shifting and strobing of specular detail as the (timelapse?) clouds cycle on the glass will also be an important bit of detail that will sell the shot.

does that help?

[Anonymous]

thank you kalthans for your help. truth is I’m newbie in VFX. I thought about doing it in after effects but have no idea how to start. I was trying to create this scene in 3dsmax and animate environment but can’t get so nice reflections and color of glass. Also the problem is that I want animation to loop and have no idea how to make clouds move the way that it won’t look choppy. There should be as little as possible frames. I just need clouds moving in the sky and in windows reflection.

[kalthans]

you can definitely do it in after effects

think of how you’d do a sky replacement in photoshop as a still then apply that thinking to AE where you’ll add motion

you can even animate the clouds in AE with just a still (a large one) of some clouds

k

[sinancg]

Also, keep in mind that mirror glassed windows are NEVER flat. You can distort the reflection layer by using a heat haze plugin and keeping its animastion parameters at zero.

Sinan Vural
Imaj

[kalthans]

using a single frame of noise as a displacement source works well, too. scaling & softening the noise along with some smoothing of the displacement will yield various results.

k

[Anonymous]

If the building is a mirror.. and your replacing the sky.. my first thought would be redo it all in 3d. Or if choose something diff to practice sky replacement on..

si

[Author]

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