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kodbitz changed their profile photo
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How to find the closest u-value on a curve intersecting a vector
petz replied to danvenn's topic in General Houdini Questions
here’s another one without relying on an iterative approach geo_along_curve.hipnc -
hey, sorry for my late reply, i didn't check the forum for quite a while … you're right, instead of rotating the prim i did project its points onto the plane given by P (prim centroid) and N (prim normal). this way you don’t have to worry about adjusting size due to the rotation. hth. petz
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Fit detail attribute into 0-1
CinnamonMetal replied to CinnamonMetal's topic in General Houdini Questions
When promoting uv from vertex to point as P, my mesh becomes completely tangled after the vertex split; as your example @konstantin magnus ? It would be because the UV are outside of the 0-1 ? -
Principled Shader's opac input removes points color when connected
grendizer replied to grendizer's topic in Lighting & Rendering
Hey Librarian. Ok here's my scene. "allow editing content": wow it's a big mess inside. Should I search inside all these nodes for the right option? Isn't there a better solution for this? "surface color (shading (utilities) )" : yeah I tried this before and I checked "use Point Color" before. I tried to plug it into "opac" or "opaccolor" but I couldn't get good results. If you know a way to use it right, it would be great. Thanks again for your help. Tr3d_EnergyBall_Preparation.hiplc -
Principled Shader's opac input removes points color when connected
Librarian replied to grendizer's topic in Lighting & Rendering
Try to play inside-shader allow editing context Surface Color Uttil and you gonna see this *image..but you must follow the Line, I don't Have your scene so we gonna assume everything Today check the use pointColor -
Principled Shader's opac input removes points color when connected
grendizer replied to grendizer's topic in Lighting & Rendering
Hello Librarian, thanks for your help. What you suggest works well with my Sphere example scene. However, it does not work with my real Particles scene, please take a lok at the attached image. Plugin the color (Cd) into the "opacity color" input does not work because I'm afraid the opacity color is not the same as the Base Color. It uses the color of the object to decide what's opaque and what's not, and so it differs from the original colors. Thanks for the advice to use the Alpha attribute. I used it in a Bind node and I tried to plug it in "opac" and "opaccolor" but it does not brings good results. I'm still wondering WHY the points color disapear when I plug ANYTHING into "opac". Thanks and see you soon, Gz -
hou.setMaxThreads HOM function:
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For keyshot I don't know, but for C4D you better to use Alembic. You will get colors in a vertex map. no need to go through a material.
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how to lock or pin a point to a specified primitive and uv ?
Ultraman replied to carthick's topic in General Houdini Questions
like this ? also you can use point deform is have more option pin3geo.hipnc -
Grids Space 3 int prim = addprim(0,"polyline"); float u; int npt = chi("npt"); for (int i;i<npt;i++){ u = PI*2*float(i)/(npt-1); vector pos = set(cos(@Time+u),sin(@Time+u), sin((u+@Time)*2)); addvertex(0,prim,addpoint(0,pos)); }
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Principled Shader's opac input removes points color when connected
Librarian replied to grendizer's topic in Lighting & Rendering
@grendizer Hm --Try also to make attr Alpha and then see what Happens ...and bind those values and mix and read Help Have Fun . -
Maybe FBX exports Houdini materials, I am not sure. So try to disocnnect the ROP node, put a principled shader on the object , keep "use point color" checked, put a white color on the base color. Then select the object node and use file > export > fbx.
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Principled Shader's opac input removes points color when connected
grendizer posted a topic in Lighting & Rendering
Here an image I did to explain the problem. The situation is very simple and I don't understand why it does not work... I put some yellow color on my sphere using a color geometry node, and I added a blue Principled Shader on sphere_object1 > tab Render > Material. So my sphere is green. in Principled shader > tab Surface > "use point color" is checked. In tab Opacity > when I move the "opacity scale" slider, everything works fine. The Sphere is still green! But I want to connect some nodes into this "opacity scale" slider, and as soon as I connect something in it, the sphere_object1's points colors is lost! The yellow is gone and only the blue base color remains, so the sphere is now blue! why WHY WHY? By the way, is the "add constant" the right way to put a value into a "multiply" node? Thanks and see you soon! Gz -
Finding Beautiful patterns in Circle(grow connect Have Fun) endless possibility ...Thanx to Asia Forums BpatternsCircleGrow.hiplc
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@wndyddl3 More Variations with this One.. I learn and share have fun DispMap.hiplc
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Fit detail attribute into 0-1
konstantin magnus replied to CinnamonMetal's topic in General Houdini Questions
However, if the world space route has no advantages for your project, you can also keep the transformation work within vertex attributes entirely. maximize_vertex_attributes.hipnc -
Fit detail attribute into 0-1
konstantin magnus replied to CinnamonMetal's topic in General Houdini Questions
Hi Christopher, you can maximize UV islands or the entire coordinate set by temporarily transferring the UV coordinates to world space where they can be fitted and transformed more easily. uv_maximize.hipnc -
here, take a grid, uv it normally so all vertices fit into 0-1 space, seen by the red circles. These vectors range from {0,0,0.5} to {1,1.0.5} dunno why the last component is 0.5, not an expert. then remap these vectors to say...double it v@uv = fit(@uv,{0,0,0.5},{1,1,0.5},{0,0,0.5},{2,2,0.5}); as you can see with the templated white lines
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Thank you very much. It worked fine. I will try to get the same result as VEX with VOP.
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Hi, guys, It's a very simple scene. A torus emit particle fluid into a box . (fig.0) I cached a compressed flip fluid , and retime(speed=0.6) it , the particle fluid surface node will not return a correct result while the "Union Compressed fluid surface" checked. It seems like the compressed fluid surface is not at the correct location and make a very strange result (fig.3). The retimed particle looks ok ,but the mesh not. fig.1 is particle, it's correct , fig.2 is compressed fluid surface, it seems not at the correct location, fig.3 is surface polygon soup. There is a very strange artifact. Is there a way to retime compressed fluid? Thanks!
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Interesting... I don't have a particular solution, but in general, if you will be able to avoid nested loops (which complexity is O(n^2)) it will increase the algorithm speed. E.g. "Find Different Elements in Two Arrays" twice faster than "Find Common Elements in Two Arrays". And keep in mind that sorting also takes time. Higher speed can be reached by the cost of higher memory usage (you can store results in a variable/hash table and check them before the next calculation). You may find some ideas here: https://leetcode.com/problems/intersection-of-two-arrays/solution/ Though on arrays of such length you would not notice any difference.
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Hi all (happy new year), I was wondering if anyone knows how to set the thread count in houdini via hython. I didn't immediately see anything in the docs.
- Yesterday
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Fit detail attribute into 0-1
CinnamonMetal replied to CinnamonMetal's topic in General Houdini Questions
I don't have a vector variable for the first parameter; only two detail attributes which I split and promoted from the vertex attribute uv. I tried the @P attribute but that won't have any effect on vertices; only attempted because it's a vector. -
how to lock or pin a point to a specified primitive and uv ?
carthick replied to carthick's topic in General Houdini Questions
hey Ryew ! thanks for the idea using rest sop.. checked the tokeru page. and tried out the rest sop. but looks like it only saves the world position , I need to lock the points on the surface geometry( like follicles in maya, they are like rivets on the surface constrained by u and v . the rotate rest fails just when i move the points away from the origin and rotate it. thanks for the reply !
