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Technical Discussion » how to randomize extruded areas in voronoi fracture
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- gswartz
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Thanks but that's not quite what I'm after. I'm trying to randomize the right most point on the thickness ramp on the spline control tab.
Technical Discussion » how to randomize extruded areas in voronoi fracture
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- gswartz
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In the attached scene file I have a voronoi sphere that I've extruded twice (colored for easier reference). My goal is to have something like Cinema 4D's plain effector that I can move around so it interacts with the 2nd extrusion (labeled inner_extrusion) and randomizes the thickness ramp on a per piece level. Is that possible and if so, how? Thanks.
Houdini Indie and Apprentice » Couple of questions about importing a model
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- gswartz
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Houdini Indie and Apprentice » Couple of questions about importing a model
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- gswartz
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I have a model of an airplane done in another program where the model is broken down into multiple mesh layers. I exported it as an alembic and imported to houdini. When I did, parts of the mesh were at different Y positions. I couldn't figure out what was going on and by accident clicked on the “Toggle local view context” menu item when I right clicked in the viewport. That caused everything to move into the correct position. I've tried looking up that command to see what it does but can't find it. I thought if I fired it again, that the mesh items would move back to their original position, but they don't. So I'm a little confused on what that's about.
Secondly, I've seen some videos where people are in houdini and in the viewport there's a window that shows the heirarchy of a mesh like what I have. I can't figure out what that window is called or how to open it. Does anyone know what I mean?
Thanks.
Secondly, I've seen some videos where people are in houdini and in the viewport there's a window that shows the heirarchy of a mesh like what I have. I can't figure out what that window is called or how to open it. Does anyone know what I mean?
Thanks.
Houdini Indie and Apprentice » help with fluid/particle sim
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- gswartz
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Thank you for the help. A couple of questions.
Do you know how I can get the orientation of the mirrored emitter surfaces reversed so both sets of emitters are spraying toward the center of the room?
And, I didn't know the collider needed to be air tight but looking at your solution I'm confused about that. Isn't the result of the boolean operation being used as the collision source and if so, the top is still open meaning it's not air tight.
Do you know how I can get the orientation of the mirrored emitter surfaces reversed so both sets of emitters are spraying toward the center of the room?
And, I didn't know the collider needed to be air tight but looking at your solution I'm confused about that. Isn't the result of the boolean operation being used as the collision source and if so, the top is still open meaning it's not air tight.
Houdini Indie and Apprentice » help with fluid/particle sim
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- gswartz
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In the example file I have built a basic room where the room is a static object and in the room are a number of circles that I've set up to emit particles from. The idea is that the circles are going to represent openings in a pipe where water is flushed out. I'm running into a number of problems getting as expected.
So, how can I get the particles to collide with the room geometry and how can I reverse the direction of the particles on the one side? Thank you!
- I've reduced the gravity quite a bit and was expecting the particles to interact with the room geometry. However they just pass through it.
- I've set up the POP Source's initial velocity to 1 in the z axis. For one side it works fine. But for the other side it's spraying in the opposite direction.
So, how can I get the particles to collide with the room geometry and how can I reverse the direction of the particles on the one side? Thank you!
Houdini Learning Materials » setting up parametric groups
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- gswartz
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vusta
In your cloth flag, I've wired the l/r groups as part of the chain instead of leaving it off to the side. Then in autodop, you simply type in the group names that you've defined instead of the full path (you could manually define these too, try simply type in say 0-9 press Enter and you'll see red spheres, constraints, created at those points)
Ah yes, ok that makes sense. Thank you for your help!
Houdini Learning Materials » setting up parametric groups
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- gswartz
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So I am trying to set up these groups as the constrained points. I thought I had the right expression in the cloth attach constraints but I'm getting this warning and error. Any idea what's wrong with my expression or setup?
constraint1:
Warning: cloth - /obj/AutoDopNetwork/clothattachconstraint1/constraint1: Constraint could not be processed by solver.
constraint1:
Warning: cloth - /obj/AutoDopNetwork/clothattachconstraint1/constraint1: Constraint could not be processed by solver.
Houdini Learning Materials » setting up parametric groups
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- gswartz
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vusta
your End is set to 900, this is the cause why it didn't work (tho you could reasonable still expected it to work) anyway, leave it at 0 which I think is equivalent to ‘unlimited’.
I've set up the Group By Range to do both left/right sides in one go…I've also referenced the Columns (from the Grid) so that you can change the Grid resolution and it will auto update.
If you want to see the effect one by one, then tick/untick the appropriate ‘tick’, by default, it's showing the result of the bottom one (left side selection)
Thank you!
Houdini Learning Materials » setting up parametric groups
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- gswartz
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Group by Range sounds right but I can't get it to work… or at least when set it up and click the Display/Render icon on the node no points are highlighted. File is attached and the Group by Range node is in the cloth node. What am I doing incorrectly? Thanks.
Houdini Learning Materials » setting up parametric groups
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- gswartz
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vusta
so you just want the borders of some geometry right ? (just use Group, untick Base group, enable Include by edges,tick unshared edges, change group type to points, might as well rename Group Name to borders for ease of reading)
Actually I don't want all edges. I want a group for the right side only edges and another group for the left side edges.
Houdini Learning Materials » setting up parametric groups
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- gswartz
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I'm also wondering if this might be better to do in an attribute wrangle node with vex… but I'm pretty new to Houdini so I'm not quite sure where to start if that were the better way to do this. Ideally I'd like to expose this group from the grid node as a parameter that I can feed into the autodop network to the cloth constraint nodes.
Houdini Learning Materials » setting up parametric groups
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- gswartz
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I have a grid set up as a cloth object. I want to constrain the points on each side to a box to hold it in place. So for example in this case it's a 30x30 grid meaning that the points on the right side go from 0,30,60,90… and on the left are 29,59,89,119,… I was hoping to feed the grid into a group node and set up some type of expression to create the group but am having trouble with it. Here's where I'm at for the first group which should give me 0,30,60,90…
0-(`chs(“../grid1/rows”)`*`chs(“../grid1/cols”)`):`chs(“../grid1/rows”)`
I get the following error:
Bad pattern specified 0-(30*30):30.
Possible problems: Number out of range or a syntax error.
Valid Syntax: start
examples: !1-10:2,3 1-10:2 * 0-5 1
So under the bad pattern specified message it is getting the count correctly from the rows and cols but not doing the multiplication to give me the result. Is my syntax incorrect or is this not possible to do? Thanks.
0-(`chs(“../grid1/rows”)`*`chs(“../grid1/cols”)`):`chs(“../grid1/rows”)`
I get the following error:
Bad pattern specified 0-(30*30):30.
Possible problems: Number out of range or a syntax error.
Valid Syntax: start
examples: !1-10:2,3 1-10:2 * 0-5 1
So under the bad pattern specified message it is getting the count correctly from the rows and cols but not doing the multiplication to give me the result. Is my syntax incorrect or is this not possible to do? Thanks.
Houdini Learning Materials » Cloth tearing in Houdini 16
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- gswartz
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Not to hijack this thread but I took the provided scene file to try and learn more about creating tearing cloth. I added a group of points down the center of the grid and wondered if there's a way to tell it to tear the cloth on the points in the group? Thanks.
Houdini Learning Materials » Boolean shatter not working on a complex model
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- gswartz
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Thank you everyone. @Bardia, I'm seeing the non-manifold error on the boolean node but it doesn't look like they show up until the boolean tries to turn it into a solid. So, is there a way that I can get a view of which edges they are so I can adjust the input geometry?
As for the rest of your explanation, I'm assuming that I need to define B as a surface instead of a solid?
As for the rest of your explanation, I'm assuming that I need to define B as a surface instead of a solid?
Houdini Learning Materials » Boolean shatter not working on a complex model
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- gswartz
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In this scene I have a scanned shell that I retopologized for lower poly count and I'm trying to use the boolean shatter to cut it up. I am using 3 grids going through mountain node into a merge node to act as the cutters. Finally, the results are run through an explode node.
When I have all three grids enabled I end up with pieces of both the shell and the grids rather than just the shell, even though I've specified Pieces of A under output geometry. If I change the input geometry to a box it works perfectly. Any ideas what's wrong? I'm including the shell obj as well as the houdini scene. Thanks.
When I have all three grids enabled I end up with pieces of both the shell and the grids rather than just the shell, even though I've specified Pieces of A under output geometry. If I change the input geometry to a box it works perfectly. Any ideas what's wrong? I'm including the shell obj as well as the houdini scene. Thanks.
Houdini Learning Materials » Scatter points density based on color
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- gswartz
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Ok thanks. So the purpose of the volume is to create the points for a voronoi fracture node. Is there a better way to be able to control the fracture so that some spots have much smaller pieces and others have larger?
Houdini Learning Materials » Scatter points density based on color
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- gswartz
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I have an iso offset node feeding into a scatter points node. I wanted to use the color attribute of the geometry node (which I had changed with a couple of paint nodes) to feed the density of the scatter points. But the color attributes are lost in the iso offset. Being new to houdini I have no idea how to get the Cd attribute after the paint nodes into the scatter points node to influence the density. Any ideas how to make this work? Thanks.
Houdini Indie and Apprentice » help with dynamics setup
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- gswartz
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I'm going through a dynamics tutorial and although I have the basic scene set up as I was just playing around with things, trying to get a better understanding of how it all worked I ran into a question.
In the attached file's main_sim's SphereRBDObject node, when the X velocity is set to 1 and the sphere hits the ground, it rolls and abruptly comes to a stop. I know I can use the angular and linear thresholds to determine when it stops, but how can I make it so it gradually slows to a stop instead of stopping all at once? Thanks!
In the attached file's main_sim's SphereRBDObject node, when the X velocity is set to 1 and the sphere hits the ground, it rolls and abruptly comes to a stop. I know I can use the angular and linear thresholds to determine when it stops, but how can I make it so it gradually slows to a stop instead of stopping all at once? Thanks!
Technical Discussion » newb question about creating groups
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- gswartz
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arctor
check this file
this is not a great way to do it - but it should help a bit
Houdini edges are not real entities - so they don't have an index, you can't do any fancy selections with them
HTH
Ok, I'm trying to break this down so I understand what's going on. As I said, I'm brand new to houdini, so please let me know if I'm incorrect here.
In the first group node you've created a group named topbot and enabled edges. I'm assuming this feeds all the edges into the 2nd group node named sides. In that you've set up the group by range with start and end of 0 and $N. I'm not clear on what this (0 and $N) does. Then select_of set to 1 and 3 so it's selecting the first and third edge?
And that selection is sent to group3. I see that your operation is happening in the combine tab, but again I'm not sure what it's doing. Can you explain this at all? Thanks so much for the help!
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