Well, long time no see…Currently I’m doing some personal R&D work in Houdini, so here’s one Work in Progress. It is still not finished, but I think it is taking a good route, so I wanted to share it here.

I promise there will be some more updates on this place in the near future as I meant to upload more Houdini materials, as well as update at least some of the old Realflow tutorials.

Video  —  Posted: April 15, 2014 in Houdini
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Realflow 2013 comes with Alembic, which is a highly anticipated multi purpose data exchange format. Instead of sticking back to old SD or other proprietary formats, Realflow can now export to Alembic or ABC. The problem is, Realflow writes on ABC per frame and most DCC applications just want one ABC per sequence. For this reason, there is Stitcher. A command line based tool that stitches those sequences together. The problem is one has to manually enter each frame one needs to have stitched. When it comes to larger sequences, that doesn’t work at all. Therefore, one of Realflow’s developers, Enrique, made this small Python script that will halp you with this issue. I think it is worth being mentioned here as it is very useful (Indents might come out incorrect, here…so better doublecheck that):

 

import glob, subprocess

# prepare command line
args = [‘C:/Program Files/Next Limit/RealFlow 2013/stitcher.exe’, ‘–in’]

#get files
for files in glob.glob(“C:/Users/Enrique/scenes/test_stitcher/objects/*.abc”):
args.append(files)

# rest of the commandline
args.append(‘–out’)
args.append(‘C:/Users/Enrique/output3.abc’)

# stitch them
p = subprocess.Popen(args, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)

# print stitch output
for line in p.stdout.readlines():
scene.message(line),
retval = p.wait()

 

It’s been a while since I’ve added some new content here. This is mainly because I was getting around very much during spring and summer, working on some really interesting projects. What’s very interesting to me is the upcoming Realflow 2013 and from what I’ve seen so far, Realflow 2013 might become an even more important update than the change from Realflow4 to Realflow5. Realflow 2013 will have Script Nodes and a completely redesigned Hybrido system, based on FLIP technology. Now, that Naiad is gone into the Dark Land of Autodesk and maybe will never come back, this new approach is even more important to the world of fluid simulation.

For those of you interested in the things going on under the hood, here’s an interesting talk by Angel Tena, Realflow’s lead developer, on how the new Hybrido will work and how far it can get improved by using GPU technology.

http://nvidia.fullviewmedia.com/siggraph2012/ondemand/SB127.html

Since I ran into this issue again, I wanted to share a tiny little script that can prevent Sheeter from crashing. Sometimes, scenes using a Sheeter Deamon crash because Sheeter is trying to fill holes in an emitter that hasn’t got any partticles, yet. This might be the case when one is trying to use Sheeter together with Filter. For example, all particles below a certain Y- pos are meant to be put into Emitter X, which has a Sheeter applied to it. Unfortunately, Sheeter starts working before there are any particles present and that makes Realflow freeze. Probably, there will be a bugfix, soon. For now, one can prevent those crashes using a simple script that creates particles for the specific emitter (EmitterX in my case)

v = vector.new(1,1,1)
emitterX.addParticle(v,v)

When working with relatively large values for Max Cavity Size, adding just one particle might not be enough! Thanks to Gus Sanchez-Perez from Nextlimit for the idea!

 

 

This is a small tutorial I recently created in order to demystify the concept of scale inside Realflow. When working in Maya default units (cm), a 14cm glass turns into a 14 meter glass after importing it to Realflow. Scaling the objects by a factor of 10 inside Realflow makes it behave strange and creates unpredictable results, so this is not  an option in most cases. Here I am going to show you how I solve these issues if they are coming up.

No matter how you are working, yo always should keep in mind Realflow isn’t working in a physically correct manner, it is an approximation that’s working good enough to trick our simple human minds. There is no Albert- Einstein- Award for working in a physically correct manner in VFX, but the need for beautiful images. You are artists, it is your job to materialze your imagination, including your imagination of correct speed and motion, it is your eye that counts.

Part two is meant to deal with Hybrido and it will be here when it’s done…

 

 

 

3d World Cover with Author Introduction

Cover of 3D World 152

The people at 3D World Magazine were so kind asking me to contribute to their magazine. Therefore, I wrote some pages on the novelties inside Reallflow 2012 giving advice on how to use the new Realflow 2012 features, i.e. Wet & Waterline, new settings and workflows as well as Retimer etc. If you are interested, you can grab an issue and maybe ask at your local magazine store for a discount…because this is Issue 152, and the new one (without me) will be in stores the day after tomorrow. Always in the fast lane…yeee-haw!

And for all those who don’t like reading that much, I will upload a new video tutorial very soon.

 

At the moment I am doing a bit of R&D work on Caronte, Realflow’s Rigid Body Solver that has been shipped with Realflow5.
It s really a great piece of software, but I’m sorry to say it is not being very intuitive to set the simulations up. Caronte is supposed to be working very close to being physically correct, so when I set up a rigid body simulation it is rather useful I know an object’s mass. In the Rigid Body tab, I can only enter values for density, which is directly influencing mass but nowhere do I see the real mass value. In order to find that out, one has to open Summary Info via the File Menu, as you can see in the image.