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Showing results for tags 'attribute vop'.
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Greetings all, I’m a relative noob in Houdini and am having a hard time trying to create a displaced noise on the mesh of a Houdini Labs Tree Trunk object. Though the Tree Trunk node is open for exploration, I don’t know enough to understand why the following is happening: I try to displace points on the trunk’s surface with procedural noise in an Attribute VOP, using a typical setup (Adding the N value to the P value), but the result appears to not push things outward, 1 to 1. (It looks like maybe things are being pushed according to a tiled UV? I can’t quite tell). I also tried using the Displace Along Normal VOP node, but can’t seem to get that working either. On the other hand, when I use an Attribute Noise SOP, I get the effect I am looking for! What is the big difference here? It appears that the noise here is working on the incoming P value, though when I change it to N, I get nothing. There are another 2 components to this I’d like to solve: With the Attribute Noise SOP, the noise displaces the entire mesh off of its center. This appears to be true no matter which range value preset I use, including ‘Zero Centered’. I would attribute this to the notion that only the points’ position values are being displaced according to the noise, and they’re not being added to their normal values for that center-outward displacement. Is there a way to do this using this node? Perhaps with an expression in one of the fields? As mentioned above, I tried to use a VOP for this, but was unable to achieve what I wanted - (I suppose that ideally someone can show me how to achieve what I need using the Attribute VOP in the first place). The other thing I’d like to achieve is some falloff, where parts of the tree mesh are or are not affected by the noise SOP. The only way I vaguely know of to do this is with an Attribute Transfer SOP and a color value run over P value, however, I hit the wall of shame when trying to figure out how to use those color values to drive the noise that drives the point position values. I imagine it can be done in a Wrangle or a VOP. I tried a few things that way, but coming up with zilch. Hoping someone can help a frustrated beginner! File is attached! (WARNING: requires Houdini Labs’ Tree Creator assets to be installed) Preemptive thanks! NpF LabsTrees_Displacement_Test_v001.hiplc
Hey there! I'm following an older Houdini tutorial and the guy is using a VOP SOP. Since I'm using Houdini 18 I just went and used a Point VOP. But now in the next step in the video he is editing the "Geometry File" parameter. When I try to do the same, I'm finding that parameter greyed-out and inaccessible (see attached images). Any help would be much appreciated so I can continue learning. Thanks in advance!
Hi I am trying to do this old POP tutorial, there is a section where he takes the red color value and modulates it with a spline ramp. (around the 4 mins mark) For some reason I cant recreate this at all. He is using a VOP sop and I am recreating it in an attribute vop , i think that should work fine . when i connect my ramp it just removes all the color. Thanks https://vimeo.com/95644892
shadowst17 posted a topic in General Houdini QuestionsHello, I want to create an attribute that over time decreases on each point depending on when they entered the event. Pretty much an age attribute. I can't seem to figure out how to get it to work as you can't seem to reference time within an Attribute VOP and any tutorials that have something similar utilise temperature or particle age which only work if using those types of FX. Any help with this would be great as feel it can't be too difficult and would be incredibly useful in a number of my projects.