Firebomb

[Houdini_VFX]

Hi,

I'm showing you a personal project I'm working on.

It's a firebomb crash inspired to 2012 movie.

I've taken the background movie with a 550D camera and I've matched that. Next I've started to

work on the simulation.

Here's a flipbook preview from the Houdini viewport, with a low res container(70 res), but

the upres container is 500 subdivision(I use it only for the final render).

See you soon with new update!

http://www.vimeo.com/16797140

Edited November 14, 2010 by Houdini_VFX

[Houdini_VFX]

First rendering test...

http://www.vimeo.com/16814382

Edited November 14, 2010 by Houdini_VFX

[Houdini_VFX]

First rendering test...

http://www.vimeo.com/16814382

Edited November 14, 2010 by Houdini_VFX

[Houdini_VFX]

Here's a new simulation/rendering test.

Upres container resolution: 300

Sim/rendering time: 48 h

http://www.vimeo.com/16918059

Edited November 17, 2010 by Houdini_VFX

[bunker]

Wow dude: 48h? There must be something really wrong with your setup

Here's a new simulation/rendering test.

Upres container resolution: 300

Sim/rendering time: 48 h

http://www.vimeo.com/16888534

[Houdini_VFX]

Wow dude: 48h? There must be something really wrong with your setup

SORRY!I've posted the old version link!

This is the correct link!

http://www.vimeo.com/16918059

[Akabane]

Well, anyway 48h for simming and rendering a fluid container with the max sampling@300 is really too much. Are you using raytrace shadows by any chance? Which part took longer? Rendering or simming?

[Houdini_VFX]

Well, anyway 48h for simming and rendering a fluid container with the max sampling@300 is really too much. Are you using raytrace shadows by any chance? Which part took longer? Rendering or simming?

Sim times: 2 hours.

Rendering times: 46 hours for 720 HD.I'm using raytrace shadows...Do you think I'll speed up the rendering with Dept Maps?

[bunker]

Use depth map shadows, you'll see the difference

Sim times: 2 hours.

Rendering times: 46 hours for 720 HD.I'm using raytrace shadows...Do you think I'll speed up the rendering with Dept Maps?

[Akabane]

You will REALLY see the difference

especially if you're using the pyro shader

(and they're more easily controllable too!)

(Do tests with 512 and only if the res is not enough crank up to 1k, just 2c)

[Houdini_VFX]

Thanks guys!I'll use depth map shadows!

[Houdini_VFX]

It seems very fast now! Thank you again, I'm not expert in lighting/shading.

One question:

I don't notice the advantages on writing out simulation files at the end of AutoDopNetwork. It seems that the time to read the simulation from disk is greater or very simular to the time to simulate! Any suggestions or workaround?

thanks in advance

[Houdini_VFX]

Simming the impact point:

http://www.vimeo.com/16958344

[Houdini_VFX]

Here's a new rendering!

I've optimized the general rendering time with depth shadows:

And I've raised up the container resolution(550)

Sim time: 8 hours

Rendering time: 2 hours

http://www.vimeo.com/17022753

[bunker]

That looks much better. Still, 8 hours is too much for that kind of sim.

Are you doing an upres of a lowres sim ?

Also try resizing your fluid container, that will save you a lot of sim time.

have a look here :

[Houdini_VFX]

That looks much better. Still, 8 hours is too much for that kind of sim.

Are you doing an upres of a lowres sim ?

Also try resizing your fluid container, that will save you a lot of sim time.

have a look here :

Thanks!

I'm using upres sim.

I haven't try to resize the fluid container yet becaus my smoke float around the entire area of the container and

there's another emitter below the terrain that activates himself a few frame before the impact so i thinked that

a resizing container wouldn't help me too much...Maybe i'm wrong!

Thanks!

[bunker]

Resizing always helps, at least that would speed up the beginning of the sim

You should try splitting your sim in 2 containers. One for the "tail" and one for the impact. That way you can tweak each sim separately without having to re-sim all and it's faster to simulate too

Thanks!

I'm using upres sim.

I haven't try to resize the fluid container yet becaus my smoke float around the entire area of the container and

there's another emitter below the terrain that activates himself a few frame before the impact so i thinked that

a resizing container wouldn't help me too much...Maybe i'm wrong!

Thanks!

[Houdini_VFX]

Resizing always helps, at least that would speed up the beginning of the sim

You should try splitting your sim in 2 containers. One for the "tail" and one for the impact. That way you can tweak each sim separately without having to re-sim all and it's faster to simulate too

Thanks for the suggestions man! ;-)

[ikarus]

well you only really need to save out the whole dop network if u are using multiple elements from the sim, else you should just use a ROP output driver from the dop import in sops, or use the built-in one on the Dop I/O node thats generated from the shelf tools. That way, the only data you have to read are the fields required for rendering, eg density/heat/rest/etc

Edited November 22, 2010 by ikarus

[Houdini_VFX]

well you only really need to save out the whole dop network if u are using multiple elements from the sim, else you should just use a ROP output driver from the dop import in sops, or use the built-in one on the Dop I/O node thats generated from the shelf tools. That way, the only data you have to read are the fields required for rendering, eg density/heat/rest/etc

Thank you a lot!Great suggestion!