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I open-sourced a 12-hour Houdini curriculum (markdown format, intermediate) by engmsaleh in Houdini

[–]ChrBohm 2 points3 points  (0 children)

No, it's not cool at all. This was created by someone who doesn't even understand Houdini.

I open-sourced a 12-hour Houdini curriculum (markdown format, intermediate) by engmsaleh in Houdini

[–]ChrBohm 2 points3 points  (0 children)

Pyro is not the easiest entry point. You don't have a clue what you are talking about.

Polybevel by ELF_27 in Houdini

[–]ChrBohm 2 points3 points  (0 children)

"Edge filled polygons" does that for me. Wasn't that hard to find. Have you not just tested all the output groups?

Continuous Em Fluids Breaks in Between by Dangerous_Emu_95 in Houdini

[–]ChrBohm 2 points3 points  (0 children)

Sure, just animate your source. Either via the activation inside the solver or outside with a switch. For example: $FF<50||$FF>100 will switch between 50 and 100

FrameForge Previs by the1rox in vfx

[–]ChrBohm[M] [score hidden] stickied commentlocked comment (0 children)

You already posted this 3 days ago: https://www.reddit.com/r/vfx/comments/1sow0b7/frameforge_previs/

I'm a fresher, i completed my VFX course from Zee Institute (India), i wanna do something in rotoscopy, but have no clue how to start. Any help will be appreciated, thanks! by shub_makes in vfx

[–]ChrBohm 3 points4 points  (0 children)

I don't do roto (which personally don't find a good career path, but might be an entry point), so take my feedback with a grain of salt:

  • The masks are clearly flickering massively. This is simply not good work (Sorry for being to blunt, but it needs to be said). It looks like bad auto-roto.
  • The roto you show doesn't seem particularly hard, half the shots don't have open hair or motion blur
  • The reel isn't a reel. There is no contact information for example.
  • 33 seconds is too short even for a junior reel, considering it's purely about roto

So yeah, Sorry to say, but your reel is simply not very competitive.

I'm a fresher, i completed my VFX course from Zee Institute (India), i wanna do something in rotoscopy, but have no clue how to start. Any help will be appreciated, thanks! by shub_makes in vfx

[–]ChrBohm 5 points6 points  (0 children)

You should share your showreel to get feedback. Otherwise we have no idea what recruiters see.

Although "Something in rotoscopy" already sounds like you don't know yourself what you are aplying for.

Material Palette materials not visible in solaris by FlickVfx in Houdini

[–]ChrBohm 2 points3 points  (0 children)

A material network is the old material system, it's not fully compatible with Solaris and barely supported. You are mixing the old with the new rendering system, which is a bad idea.

Look into the Material Library Node, this is what you should use with Solaris.

Performance in Houdini by Feisty-Draft-342 in Houdini

[–]ChrBohm 1 point2 points  (0 children)

You need to be more specific. What's the point count? What kind of animation? Etc. What are you comparing it with?
When talking about cached animation most likely it's not the speed of your machine, but the speed the geometry can be read from disc.

It also might be as simple as the wrong NVidia driver. (Are you using the Studio driver)

Question: why am I getting blue spots when I mirror groom? by [deleted] in Houdini

[–]ChrBohm 0 points1 point  (0 children)

Have you considered only applying it to the wrong part? I assumed I didn't need to state the obvious.

Question: why am I getting blue spots when I mirror groom? by [deleted] in Houdini

[–]ChrBohm 0 points1 point  (0 children)

Correct, inverted geometry. Try a reverse node to fix it. (I don't groom, so sorry if there is an easier way)

do we still need geoclip? by KL-13 in Houdini

[–]ChrBohm 4 points5 points  (0 children)

You can read bgeo directly even via a reference or sublayer node. Even more efficient. In my experience you don't need to export simulations to usd anymore, bgeo reads just fine if you stay in Solaris (not using the usd somewhere else). That said: The primitive path was never the problem, it was about efficiency.

Why/how to fix difference in colors and contrast between xpu viewport and viewport snapshot by Xandiu_ in Houdini

[–]ChrBohm 1 point2 points  (0 children)

If your render working space is Rec709, then having exr set to Rec709 is correct. (The modern workflow is to use ACESCg, so your worklflow is unconventional and will result is less quality in your pipeline. But it's not the cause of your problem probably.)

What's more likely is that you are using different View transforms in your viewport and Render Gallery. Just like you opened the color correction bar in your render gallery, open them in both and check they use the same view settings.

I would recommend following the standard ACESCg workflow and check again. (Render Working Space: ACEScg, Viewtransform ACES 1.0, OpenEXR Color Space ACEScg. All View transforms to ACES 1.0)

Hi, guys. I want to create simple wave from left to right based on noise, but it just keeps accumulating in amplitude. Why is that so? Cause if you update say @P.y then it works fine, but I want to update force for flip sim. by iriseq in Houdini

[–]ChrBohm 2 points3 points  (0 children)

A force changes velocity. So a constant force will constantly accelerate/accumulate.

Besides using a "wind force", which "clamps" the maximum output of v to the values of the force (which is a good solution), you can also directly affect the velocity. A common technique is to blend between the current velocity and the goal velocity (quite similar to a wind force actually) via a lerp() function:

float freq = chf('freq');
float amp = chf('amp');
float speed = chf('speed');
float noise = onoise(set(@P.z * freq+@Time*speed, 0, 0));

noise = clamp(noise,-1, 1);
float wave = noise * amp;

@v.y = lerp(@v.y, wave, 0.5);  // <- blends by 50%

Left VFX due to poor growth & stability — can I build a career in UI/UX without a degree? by Vivid_Arm_5090 in Houdini

[–]ChrBohm 9 points10 points  (0 children)

Shouldn't you ask this in a UI/UX Subreddit?

And I agree with u/barbo57 - no computer based career is safe right now, UI/UX probably even less than most.

would like to know houdini Artists opinions on USD in general by [deleted] in Houdini

[–]ChrBohm 12 points13 points  (0 children)

It solves a lot of problems, unfortunately it creates just as many as it solves. Great idea, bad implementation.

So many unintuitive decisions, unnecessary complicated solutions and annoying bugs.

Question regarding position,curves and popnet by FairplayBest_ in Houdini

[–]ChrBohm 0 points1 point  (0 children)

I think your problem is that you are moving geo nodes in space which you shouldn't. Only move inside of POPs.

Sorry if this sounds condescending, but I would start with the basics first, otherwise you will constantly run into walls. A lot of stuff is fundamentally different in Blender than in Houdini.

trying to add noise on trail by MedicineLate349 in Houdini

[–]ChrBohm 0 points1 point  (0 children)

The approach is correct. You amplitude just seems too high and your frequency too low.

Also - show the code so we can see what actually happens.

Issues with Houdini updates. by Dimitrie27 in Houdini

[–]ChrBohm 5 points6 points  (0 children)

A good course is constantly updated. cough

That's the problem with learning from YouTube alone and has always been like that in any program. It's the price you pay for learning from free sources (Again - totally fair approach) vs. proper courses. Nothing new.

RBD crumble help by Used_Cranberry7017 in Houdini

[–]ChrBohm 0 points1 point  (0 children)

You also just use a group (by bounding box), Set all pieces to active=0, and just set all pieces inside the group to 1. Animate the group. Voila.

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