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Everything posted by konstantin magnus
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Here's a way to draw a 2D SDF-curve. sdf_curve.hipnc
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How would you blend positions between meshes with different topology and uneven point count? My idea was to use the 'underlying' primitive's intrinsic UV coordinates for matching. But when transfering to world position I run into this typical "fix boundary seams"-issue known from the UV texture-node. blend_pos.hip
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Resample in VEX? (imitate Resample SOP | resample vector array)
konstantin magnus replied to Krion's topic in Scripting
Hi @Krion, the spline()-function can do this: https://www.sidefx.com/docs/houdini/vex/functions/spline.html -
I need to find a way to detangle some spheres...
konstantin magnus replied to Masoud's topic in General Houdini Questions
Hi Masoud, there are probably some particle operators doing the same thing faster, but you could pull and push a voronoi-network according to the point scales until all spheres are deintersected. deintersect_spheres.hip -
Geometry Object conforming to another Geometry surface
konstantin magnus replied to virgile's topic in Modeling
Hi @virgile, you could blend positions based on their distance towards the surface: In a point wrangle with first input mesh, second input sphere: float d_min = chf('min_distance'); float d_max = chf('max_distance'); int prim; vector uvw; float d = xyzdist(1, v@P, prim, uvw); vector pos = primuv(1, 'P', prim, uvw); float mask = smooth(d_min, d_max, d); v@P = lerp(pos, v@P, mask); conform_to_surface.hipnc -
What would be the current preferred language to script patterns for Renderman inside Solaris? Eg. turning UV coordinates into dots and stripes as color vectors or float masks: vector uv = v@uv; float d = distance( frac(uv*8), {0.5, 0.5, 0.0} ); float c = 1.0 - smooth(0.2, 0.5, d); v@Cd = c;
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You would need another vector called "up" that points upwards, eg. v@up = {0,1,0};
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Keep primitive attributes when I save as obj
konstantin magnus replied to anicg's topic in General Houdini Questions
Hi Mani, before exporting you can promote primitive attributes to vertex UVs and/or vertex normals and promote them back after importing the OBJ. Wikipedia describes the OBJ-format: The OBJ file format is a simple data-format that represents 3D geometry alone — namely, the position of each vertex, the UV position of each texture coordinate vertex, vertex normals, and the faces that make each polygon defined as a list of vertices, and texture vertices. obj_attrib.hip -
Questions about edgeequalize node and topology. thanks
konstantin magnus replied to markmu's topic in Modeling
Try the circle from edges-node in case the holes are supposed to be circular. -
coplaner polys inside another wanting to remove
konstantin magnus replied to Trilec's topic in Modeling
Hi Curt, did you look into the hole SOP? -
I need some advice on the ripples of the ship.
konstantin magnus replied to eunchae's topic in Effects
There is a Kelvin Wakes deformer in SideFX Lab's now: https://www.sidefx.com/docs/houdini/nodes/sop/labs--kelvin_wakes_deformer-1.0.html -
How to vertically align a uv texture?
konstantin magnus replied to Bill Mill's topic in General Houdini Questions
Polyextrude does UVs. Just assign UVs on the grid in advance and ignore the viewport issue that comes later. extrude_uv.hip -
VEX version: float t = chf('threshold'); v@P.y = -abs(v@P.x - t) + t;
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Hi! I am looking for a (more compact) function that switches downwards after a certain value is reached. thank you! threshold.hiplc
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skin node from cross sections with UV's
konstantin magnus replied to forbidden14's topic in General Houdini Questions
Hi Dana, I'd recommend to look into the sweep node again. It accepts pscale and scale attributes for varying widths, creates UVs and has lots of other useful features such as creating primrow and primcol attributes eg. for lanes. -
The Labs Straight Skeleton 3D node creates curves through the middle: https://www.sidefx.com/docs/houdini/nodes/sop/labs--straight_skeleton_3d.html
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Rotating each item on its own individual axis?
konstantin magnus replied to archz2's topic in General Houdini Questions
Handling per object-rotations gets easier after packing and instancing the copies. Eg. the primitive node can do random rotations afterwards. copies_rotate.hipnc -
Create point group which are not connected
konstantin magnus replied to Apurba Haldar's topic in General Houdini Questions
Hi Apurba, presumably by setting the cluster node to 6? -
Rotating each item on its own individual axis?
konstantin magnus replied to archz2's topic in General Houdini Questions
You would usually define the point orientation before copying objects to them. The normal vector "N" pointing to the front and the up vector "up" pointing upwards, eg. perpendicular to the surface. Next you can rotate the up vector around the normals using a point wrangle. float amount = chf('amount'); matrix3 m = ident(); rotate(m, amount * M_PI, v@N); v@up *= m; There are many other ways and as per usual Matt's CG wiki has a good read on this: https://www.tokeru.com/cgwiki/index.php?title=JoyOfVex17 rotate_up.hipnc -
The sweep node has a rolling function. loop_shape.hipnc
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Hi Guan, exactly, the polyextrude node can take all sorts of masks and measurements for individually orienting and scaling its extrusions. extrude_feather.hipnc
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What's a Good Way I Can Erode Geometry Like a Daniel Arsham Sculpture
konstantin magnus replied to collidal's topic in Effects
Hi Ahmed, there are specific volume noise nodes now which even support masks. erode_volume.hipnc -
Hi Ronald, the sweep SOP surface can be set to rows. It accepts pscale, up and N attributes as well as cross section curves for the second input. sweep_rows.hipnc
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I wrote an article explaining the code for the COPs raytracer a little: https://procegen.konstantinmagnus.de/custom-raytracer
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I wrote a custom render engine in COPs today. While 'engine' is probably a bit far fetched, it's a little ray tracer experimentally supporting: Meshes with UV coordinates Shading on diffuse textures Multiple point lights (including color, intensity, size) Area shadows and light attenuation Ambient occlusion Specular highlights Reflections with varying roughness The snippet basically transforms the pixel canvas to the camera position and shoots rays around using VEX functions like intersect() and primuv(). The rendering process only takes a few seconds. I still have to figure the licensing fees, though COP_render.hipnc
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