jamesearnest244

Hi, I want to assign hotkeys to certain actions that don't appear in the Hotkey Editor. For example, checking on/off the Slide on Surface option on the Edit node, or the Output Back on the PolyExtrude node. These nodes have other toggles that appear as actions in the Hotkey Editor, but these one don't. Is there a way to add actions like this? Thanks for any tips!

Hi, Is there a way to assign hotkeys to specific shading modes in the viewport? I know I can use W to toggle between wireframe and the last selected shading mode, but I'd like to have specific hotkeys for Wireframe Ghost, Flat Wire Shaded, etc. If I use Ctrl+Alt+Shift+LMB, I get a prompt saying the hotkey couldn't be created. BTW, would also be nice to assign hotkeys to Hide Other Objects/Ghost Other Objects, but I'm seeing the same problem there. Thanks!

Has this hotkey been changed since Houdini 16? The + and - don't seem to do anything in Houdini 18. I've read about this having been changed to Shift +/-, but that doesn't work either.

Hi, I'm working on a sim of milk being poured into a cup of coffee. The coffee part is brought into the FLIP Object as Initial Data, and the milk is sourced in with a Volume Source DOP. I would like to control the collision velocity of the two different fluids, so I can control the size of the splash when they meet. The problem is, the Collision Scale attribute on the FLIP solver only controls collisions with other DOP objects, not within the fluid itself. I don't want to increase the velocity of the incoming particles, just to make the reaction of the fluid stronger. Thanks for any tips!

Interesting, I'll give this a whirl on the weekend. Still I'm pretty sure there's a way to get around this issue with FLIP. I wonder...

-Reply created by mistake-

Hi, I'd like to ask if anyone has a methodology they can share for approaching small scale FLIP simulations. We all know FLIP has stability issues when working in the real-world scale of coffee cups and cereal bowls. But I haven't found any info that addresses directly how to get around that. If you scale the scene up by, say, 10, to get to units Houdini is more comfortable with, do you then need to: scale up gravity? Scale up collision velocity? Scale up Time Scale? I've read about the Spatial Scale setting in the Solver tab, but when I go by the documentation and set it to 0.01 (for a scene modeled in centimeters), I can't get even one frame simmed. IMHO since it's an exact scale of units, there must be a simple mathematical way to accomplish this in a couple of settings to get things to match up. Or am I wrong and it's going to take endless tweaking just to get things looking sorta right? I'd appreciate any input!

I finally figured it out! I had to write icmax(0, $C) in the expression CHOP. When writing icmax(0,0) it was using the 0th channel's data and applying it to all the channels, instead of evaluating per channel. So writing $C in an expression CHOP is kind of like writing @ptnum in point wrangles. I'm attaching the file in case anyone else runs into this in the future. Thanks @Librarian for sticking around! Chops_MaxValue_Solution.hipnc

I added the simplest use case I can think of to the last file you attached - deleting all points that exceed a certain speed at any time. But I don't want to delete them only when they reach that speed - if they are going to exceed it at any point in the future, then delete them right from the beginning (that way the point count remains consistent). The last file you attached does assign consistent values to the points, but they're not the actual speed values. I'm not sure what they are. So the wrangle I put in doesn't do what it's supposed to. CHOPS_UseCase.hipnc

But now all the points have the same value, that can't be right. I think the Combine Channels operation on the Math node makes it take the maximum value any of the points reaches, and applies that value to all of them. Look here at the info on the Geometry node - these are the values I want to extract per-point. Is there a way to turn these values into attributes on the points themselves? So, for point 0, @max_speed = 2.1371527. For point 1, @max_speed = 2.371021, etc... I'm trying all sorts of approaches and can't get it to work. I found the function chinputlimits in the documentation, maybe that's the key? I'm just so inexperienced in CHOPS I don't seem to be using this function correctly in my attempts.

I really appreciate your help, it's just still not quite what I'm after (I hope I'm not asking too much). The speed attribute here is still changing per frame. I'll try to be as clear as I can: Let's assume that point X has @speed=1 in the beginning of the animation, @speed=5 in the middle, and @speed=3 in the last frame. I want to generate the attribute @max_speed=5. This value would be different per point, but would be constant throughout the animation, because every point has a definite maximum speed that it reaches. There are actually many situations where I find this info would be useful. Any time I'm modifying values with ramps, clamps and the like in VOPS and need some precision, rather than eyeballing it by plugging into the Cd output.

Thanks for your help with the file! But the values here are still changing every frame, so it's not quite what I'm after. If I understand this correctly, what this setup seems to be doing is mapping the current speed of the points on the current frame to a range of 0 to 1, with respect to the maximum speed attained at any time. What I need is every point's actual maximum speed value, not a 0-1 mapping of it. Do you maybe have another idea how to get this data?

I do get values, but they change every frame, so clearly they're not the values I'm looking for. I need to get the maximum value the attribute reaches at any time over the course of the animation.

Hi, I know this is a super old thread, but I'm trying to accomplish the same thing with no luck. I attached a simple example file. I'm trying to have CHOPS overwrite the speed attribute with the maximum speed that each point reaches over the course of the animation. Ultimately, I'd like to know the maximum value any of the points reaches. I'd appreciate if anyone could point me to what I'm doing wrong. Thanks! chop_help.hipnc

Thanks ikoon for the quick answer!