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Technical Discussion » Mantra: How is the ETA calculated
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- jsmack
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The first one. The ETA is rarely accurate, unless your scene completely fills the frame.
Technical Discussion » Import Pop Field into SOPS
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- jsmack
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most of the pop forces don't use any fields. They are basically shaders that act on the particles position/velocity/force. There is nothing to export, as they only exist implicitly as code.
Houdini Lounge » Mantra max value clamp
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- jsmack
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You don't really want to clamp unfiltered/uncomposited samples. Let the film lut (2D color pipeline) do the work.
If you really must, then you can modify the pathtracer fog shader used by the pbr engine to clamp Cf before export.
If you really must, then you can modify the pathtracer fog shader used by the pbr engine to clamp Cf before export.
Technical Discussion » Rendering 4K takes too much time!
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- jsmack
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Make sure you are not comparing in a renderview in preview mode, as the elapsed time for a preview render is meaningless.
Technical Discussion » HDA for importing alembic Maya camera with scaling
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- jsmack
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For my alembic camera asset, I use python expressions on the transform channels that reference the alembic through the _alembic_hom_extentions module directly. This allows me to get the world transform and apply the scale after cracking the transform. this way the asset is self-contained, and doesn't require any embedded, editable, or hidden nodes.
Technical Discussion » Alembic: Getting correct transform/shape names back into Maya
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- jsmack
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When using an explicit path attribute, and the ‘transform’ part of the path is unique for each packed primitive, configure the alembic rop as such:
Build Hierarchy From Attribute ( On )
Path Attribute ( path )
Packed Transform ( Merge With Parent Transform )
Use Instancing Where possible ( Off )
Build Hierarchy From Attribute ( On )
Path Attribute ( path )
Packed Transform ( Merge With Parent Transform )
Use Instancing Where possible ( Off )
Technical Discussion » How to control brightness of Volumes in Scene View
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- jsmack
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Technical Discussion » Why my expression is '0'?
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- jsmack
- 1424 posts
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Those look like string attributes. You can't use point() with string attributes. There are string versions of each of the attribute reference functions ending in ‘s’, ie “points()”
Houdini Learning Materials » Transparent Opacity/Alpha Viewing Render View
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- jsmack
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Glass/water materials will render opaque/solid alpha, as the refracted ray transmits the color from behind/through the object. Alpha transparency is used for sprite/particle effects or for other non-physical effects.
Technical Discussion » Mantra uses eats CPU and RAM on pause
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- jsmack
- 1424 posts
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Oh that pause, I thought you meant the pause button in the IPR dialog. The pause sequence button might not interrupt certain processes, but it will prevent the next frame from starting.
Technical Discussion » Process POP Wrangle only once per frame in a multi sub-step POP solver?
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- jsmack
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Houdini Indie and Apprentice » PLEASE HELP Resuming Interrupted Render or Changing the Start Frame in a Mantra Node
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- jsmack
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Houdini Indie and Apprentice » Changing For Loop from v14 to v16 and Softdot issue.
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- jsmack
- 1424 posts
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Soft dots takes a vector as the coordinate space input for convenience, no need to split the vector into component floats.
Technical Discussion » Mantra uses eats CPU and RAM on pause
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- jsmack
- 1424 posts
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Cpu usage goes to 0 on pause, memory usage should remain unchanged, as it needs to hold onto the memory to resume.
Technical Discussion » Classic shader
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- jsmack
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Technical Discussion » How to export Attributes to Alembic on the Transform Node
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- jsmack
- 1424 posts
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Houdini Indie and Apprentice » copy stamping syntax error
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- jsmack
- 1424 posts
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It's hard to say what your problem is since you didn't post what the stamp expressions you are using are, and where they are used. What's on the other end of the object merge, a point cloud?
On a more general note, we don't really use copy stamping anymore, and particularly not for transforming copies. Using instance attributes (pscale, trans, orient, pivot, etc) on template points is much faster and more convenient since you can use vops/wrangles/attribrandomize/etc to modify the attributes however you like.
See ‘copytopoints’ documentation: http://www.sidefx.com/docs/houdini/copy/copytopoints.html [www.sidefx.com]
On a more general note, we don't really use copy stamping anymore, and particularly not for transforming copies. Using instance attributes (pscale, trans, orient, pivot, etc) on template points is much faster and more convenient since you can use vops/wrangles/attribrandomize/etc to modify the attributes however you like.
See ‘copytopoints’ documentation: http://www.sidefx.com/docs/houdini/copy/copytopoints.html [www.sidefx.com]
Houdini Indie and Apprentice » Group selection accuracy
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- jsmack
- 1424 posts
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Houdini Indie and Apprentice » Prabola equation on point @P.y values
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- jsmack
- 1424 posts
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If you make it a proper test with lots of cables, you can see that looping over the points in a prim wrangle is an order of magnitude slower than the using a pointwrangle.
Houdini Indie and Apprentice » Prabola equation on point @P.y values
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- jsmack
- 1424 posts
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A detail wrangle is single threaded, whereas the point vop is multi-threaded. The idea is you can create thousands of lines, doesn't matter how because it won't be the repeated part, and use the pointvop to move points after the fact, which will probably be a repeated operation as sagging amount is either animated or art directed. The point vop stays fast even with hundreds of thousands of lines.
In this example 200,000 cables sway in realtime. The cable generation part is maybe not the fastest way to go about it, but since it's not animated it not the focus for performance improvement.
In this example 200,000 cables sway in realtime. The cable generation part is maybe not the fastest way to go about it, but since it's not animated it not the focus for performance improvement.
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