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Houdini Indie and Apprentice » Voronoi fracture with an alembic
- Enivob
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There is an example file of a deforming fracturing mesh on the Tokeru [tokeru.com] site. Maybe it can help?
Houdini Learning Materials » Sweep vs Copy
- Enivob
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PolyFrame before a Copy is fairly standard. You have to set the normal name to up and the tangent name to N.
Edited by Enivob - Jan. 16, 2017 13:02:13
Technical Discussion » How to make FLIP fluid pre-fill fountain bowls
- Enivob
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NOTE: Your scene file did not seem to attach..?
What I have done in the past is to prepare an object in the shape of the bowl/basin. Then turn that object into fluid, not an emitter. So you have two fluid objects, one is a start up amount of fluid and the other is an emitter which can create additional fluid to fall into that initial fluid.
I used a cookie with a box subtract against my obstacle object to create the initial fluid for the basin in my waterfall. Then you can use the Fluid From Object shelf tool on that resulting object to include it into the flip sim as an initial fluid amount.
What I have done in the past is to prepare an object in the shape of the bowl/basin. Then turn that object into fluid, not an emitter. So you have two fluid objects, one is a start up amount of fluid and the other is an emitter which can create additional fluid to fall into that initial fluid.
I used a cookie with a box subtract against my obstacle object to create the initial fluid for the basin in my waterfall. Then you can use the Fluid From Object shelf tool on that resulting object to include it into the flip sim as an initial fluid amount.
Edited by Enivob - Jan. 16, 2017 12:55:02
Technical Discussion » the best machine specs for Houdini
- Enivob
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Thank you moogtastic, I have been struggling with sim detail on a 32GB machine and wondered if that was my problem. I guess a machine upgrade is in my future.
Houdini Learning Materials » Sweep Node path matching
- Enivob
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If the sweep works as needed along XY then just use the old pre-transform, post-transform fix. By that I mean drop down a transform node to rotate to the axis that works then after the work is done “un-rotate” it back to your target axis.
Technical Discussion » Imported OBJ polygon limit
- Enivob
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I was unaware of a limit, but while you are waiting pull up the Windows Task Manager or OSX Activity Monitor and examine how much memory is actually being used. Once you exceed physical memory, a slow down may occur. What is the CPU load while you are waiting, is there CPU activity?
Also, the venerable OBJ format is ASCII text based so a five million polygon mesh needs at least three vertices per-face so that gets us up to fifteen million points or more which can be a slow import considering the import routine is probably only single core.
Also try to use a different word other than “freeze”. To me, a frozen system is nothing works at all, the mouse won't move etc.. Is that your experience? Is your entire desktop “frozen” or is Houdini just busy reading your jinormous file?
Also, the venerable OBJ format is ASCII text based so a five million polygon mesh needs at least three vertices per-face so that gets us up to fifteen million points or more which can be a slow import considering the import routine is probably only single core.
Also try to use a different word other than “freeze”. To me, a frozen system is nothing works at all, the mouse won't move etc.. Is that your experience? Is your entire desktop “frozen” or is Houdini just busy reading your jinormous file?
Technical Discussion » First Work with Houdini Indie - License Downgraded?
- Enivob
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Yes, make sure you are launching Houdini Indie icon.
If you have created a HIP file using Apprentice prior to Indie licensing, loading it into Indie will downgrade the license back to non-commercial. Conceptually, the HIP file contains the license from the application that built the file. Also copy/paste nodes from an Apprentice HIP into an Indie HIP will also downgrade the license. The nodes themselves know where they were originally created and adjust the license to match.
If you are using an HDA or OTL that was authored in Apprentice, your license will be downgraded as well.
If you have a file that you created using Apprentice you can contact support and they will convert it to a non-apprentice version that will work with your Indie license.
If you have created a HIP file using Apprentice prior to Indie licensing, loading it into Indie will downgrade the license back to non-commercial. Conceptually, the HIP file contains the license from the application that built the file. Also copy/paste nodes from an Apprentice HIP into an Indie HIP will also downgrade the license. The nodes themselves know where they were originally created and adjust the license to match.
If you are using an HDA or OTL that was authored in Apprentice, your license will be downgraded as well.
If you have a file that you created using Apprentice you can contact support and they will convert it to a non-apprentice version that will work with your Indie license.
Technical Discussion » the best machine specs for Houdini
- Enivob
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I vote for more processors and a fast Ghz CPU speed. Some Houdini processes are still single threaded. You may notice as you get used to more cores. All of a sudden your workflow is broken. You get bored waiting and check the CPU monitor to see that Houdini is only using a single core. At these times it is nice to have a fast CPU, 4Ghz or better.
Multiple GPUs are mainly needed for third party GPU rendering with engines such as Reshift or Octane, Houdini's Mantra does not need more than one video card.
Take a look at this website for building custom VFX machines, no I have not used them but the product looks great.
https://www.mediaworkstations.net/product/i-x2/ [mediaworkstations.net]
Multiple GPUs are mainly needed for third party GPU rendering with engines such as Reshift or Octane, Houdini's Mantra does not need more than one video card.
Take a look at this website for building custom VFX machines, no I have not used them but the product looks great.
https://www.mediaworkstations.net/product/i-x2/ [mediaworkstations.net]
Houdini Learning Materials » Boxes that changes in Pscale & colour based on size?
- Enivob
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Take a look at some of the examples on Tokeru [tokeru.com]. Matt has some example files posted demonstrating how to change size color via an effector.
Houdini Lounge » Alternative to Premier and Davinci
- Enivob
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Blender has an image sequencer that supports sound as well.
Try using TIFF files instead of OpenEXR file for your final output.
Try using TIFF files instead of OpenEXR file for your final output.
Houdini Learning Materials » (semi) transparent materials when mixing FLIP fluids ?
- Enivob
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Here is more like what I was suggesting, modifying your original file. Use a MantraSurface, not the Principled shader which lacks opacity support, and apply a map to the Opacity channel. In this image the checkerboard pattern can clearly be seen removing part of the fluid. But the UVs are stretched so is the checkboard patterns removal capabilities. Try playing around with other projection or UV generation techniques.
Edited by Enivob - Jan. 10, 2017 20:36:27
Houdini Learning Materials » (semi) transparent materials when mixing FLIP fluids ?
- Enivob
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Hmm..after playing around with your file and basically rebuilding it I can get some UVs transferred but they certainly look stretched. I tried out Jeff Wagner's dual rest approach and it does seem to be broken on 15.5.673. Even he experiences a problem in the video.
But a basic box project after surfacing allows some UV work. In this example a companion set of particles is generated from the original source volumes. UVs are attribute transferred to the particle points and travel through the entire FLIP system back out to surfacing.
But a basic box project after surfacing allows some UV work. In this example a companion set of particles is generated from the original source volumes. UVs are attribute transferred to the particle points and travel through the entire FLIP system back out to surfacing.
Edited by Enivob - Jan. 10, 2017 18:14:31
Houdini Learning Materials » (semi) transparent materials when mixing FLIP fluids ?
- Enivob
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Houdini Learning Materials » Unwrapping Rectangular Prisms - How do I make the UV's pack and align vertically and horizontally?
- Enivob
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Try adding a UV Layout node at the end of your network and view the results in the UV view. Read the help card and try out the parameters. There are some packing and arrangement options as well as UDIM support.
Houdini Indie and Apprentice » Principal Shader Error
- Enivob
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Works for me on my Windows system using Houdini 15.5.673.
What hardware are you using? Does it meet the minimum requirements to run Houdini?
What hardware are you using? Does it meet the minimum requirements to run Houdini?
Houdini Learning Materials » (semi) transparent materials when mixing FLIP fluids ?
- Enivob
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Check out Jeff's webinar on FLIP fluid [vimeo.com] ~1:19:09. He talks about adding UVs to flip using a RestSolver inside a VOP. This is after you have enabled the dual rest checkbox.
Houdini Learning Materials » (semi) transparent materials when mixing FLIP fluids ?
- Enivob
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I guess the next question is what does your opacity map look like and do you have UVs on your fluid? Mapping only works if you have UVs. If you drop down a UV Quickshade node you can visualize your UV layout in the viewport.
Edited by Enivob - Jan. 9, 2017 09:38:00
Houdini Indie and Apprentice » Revolve and keep normals
- Enivob
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This is kind of close. Basically copying your prepared circle along another circle with an alternate PolyFrame configuration. The alternate PolyFrame sets up the orientation of your source circle as it is copied to the various points along the path. Follow up the Copy with a Skin and you have the option of having the surface open or closed on the end. Turn V Wrap on to close the torus.
Edited by Enivob - Jan. 7, 2017 21:56:42
Technical Discussion » Setting Parameter Spreadsheet through python
- Enivob
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Darn, I was hoping there was simply a list of rectangles under pane. Then you might be able to locate one of those input fields and populate it.
If you were on Windows you could do it with a brute force mouse move and click issued to screen coordinates within the target rectangular area of the Op Mask field. I'm not sure how to control the mouse position and click on OSX or Linux. But you might want to think along those lines. If you can control where the pane pops up on the screen, you can then assume where the other two fields are located based on pure screen coordinates. Issue a mouse move and click to that location then issue some kind of system send keyboard command with the data you want to populate the field with.
Controlling the mouse and keyboard directly is certainly a hackey approach but the API may need extending to provide access to these fields. Perhaps file a feature request to support@sidefx.com.
If you were on Windows you could do it with a brute force mouse move and click issued to screen coordinates within the target rectangular area of the Op Mask field. I'm not sure how to control the mouse position and click on OSX or Linux. But you might want to think along those lines. If you can control where the pane pops up on the screen, you can then assume where the other two fields are located based on pure screen coordinates. Issue a mouse move and click to that location then issue some kind of system send keyboard command with the data you want to populate the field with.
Controlling the mouse and keyboard directly is certainly a hackey approach but the API may need extending to provide access to these fields. Perhaps file a feature request to support@sidefx.com.
Edited by Enivob - Jan. 7, 2017 21:35:14
Houdini Learning Materials » (semi) transparent materials when mixing FLIP fluids ?
- Enivob
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Have you tried setting the Opacity Scale, on the Opacity tab, for the Diffuse Surface of the Mantra Shader to 0? I have had to lower this to 0 to get texture based alpha to work. Perhaps it can work for you too? Even though the name is “scale” it seems to act like a “sum” instead of a multiply. When 1 no alpha/opacity gets through.
Edited by Enivob - Jan. 7, 2017 15:15:17
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