Change seed, resimulate and flipbook automatically

[syzmatrix]

This page and this video

http://s3.amazonaws.com/vfx/two_building_collapse_wedge_seed.mp4

In this video, Johner changed seed,resimulated and flip book automaticly for 20 times. I wonder how can we do the same thing, is it possible for someone to give a idea?

thanks very much

best

Sun

[old school]

Have a look at the Wedge ROP.

You point it at another output ROP driver, like a Geometry ROP set up to render out your geometry sequence.

The Wedge ROP points to the ROP set up to render out whatever. You use stamp variable $WEDGE in the file name in your Geometry ROP something like this:

$HIP/geo/my_geometry_${WEDGE}_$F4.bgeo

The {} are required to properly qualify the variable btw.

The Wedge ROP can now change parameters anywhere in Houdini per wedge pass. You reference in those parameters using a complete path to the parameter. There are two modes as well: random or by iteration.

[Nerox]

I think what Syzmatrix is trying to say, is that he would like to automate the process and I guess it's particularly the part of, after a wedge is finished, triggering a flipbook.

I fantasized about this before, especially because the wedge ROP is very powerful tool to test multiple settings with a minimum amount of effort. The point is that if you generate 10 variations of a sim overnight, you have to manually load them in and flipbook them to get an idea of the result. The problem with this is, is that it can take a lot of time which feels a bit odd since the wedge ROP idea is the opposite. I haven't tested this, but one option would be to do a very quick and cheap mantra render after the sim by connecting a mantra rop to the sim ROP triggered by the Wedge ROP. If you set correct reference paths this should work. If you have access to a farm this makes sense since farm machines usually have no GPU, how ever if you run it on your local machine overnight, it would be faster to use a flipbook method.

I guess the next question would be: Can we trigger a flipbook using a post Python script on a ROP, and halt wedge until the flipbook is finished?

[old school]

oh...

Look in to the viewwrite hscript command then. I guess you could trigger this with a Shell ROP executing a post render script.

Drive this with the Wedge ROP?

[syzmatrix]

thanks very much, I will try it as soon as possible

[Owl]

icon isn`t mine, but i liked it sooo much i couldn`t resist

this should fill your basic needs

owl_flipbook_f0_v0_0_8.otl

(curently no motion blur and dof support)

i made an svg with ilustrator, but it makes hsvg throw an error :/ don`t know why...

Edited March 25, 2011 by Owl

[syzmatrix]

great, thank you a lot!!.

[Yon]

Anyone know how to use this

running wedge off it does nothing

 

edit - just gonna wedge opengl rop

Edited October 16, 2016 by Yon Anadeyo