# konstantin magnus

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Konstantin Magnus
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1. ## Mycelium growth

Hi Robert, yes, you can integrate the minimal surface position with the ray node or minpos(). I've added the pig head to the food input to motivate growth there, as well. mycelium_3d.hipnc
2. ## Line tracer infection

Hi @sessionbeer, not quite the same, but this one comes close: https://procegen.konstantinmagnus.de/growing-a-mycelium
3. ## signed distance outline curves

Here's a way to draw a 2D SDF-curve. sdf_curve.hipnc
4. ## Resample in VEX? (imitate Resample SOP | resample vector array)

Hi @Krion, the spline()-function can do this: https://www.sidefx.com/docs/houdini/vex/functions/spline.html
5. ## I need to find a way to detangle some spheres...

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
6. ## Geometry Object conforming to another Geometry surface

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
7. ## Preferred scripting language for Renderman

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;
8. ## How to set normals to look up

You would need another vector called "up" that points upwards, eg. v@up = {0,1,0};
9. ## Keep primitive attributes when I save as obj

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
10. ## Questions about edgeequalize node and topology. thanks

Try the circle from edges-node in case the holes are supposed to be circular.
11. ## coplaner polys inside another wanting to remove

Hi Curt, did you look into the hole SOP?
12. ## I need some advice on the ripples of the ship.

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
13. ## Blend positions between uneven topology meshes

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
14. ## How to vertically align a uv texture?

Polyextrude does UVs. Just assign UVs on the grid in advance and ignore the viewport issue that comes later. extrude_uv.hip
15. ## Threshold function

VEX version: float t = chf('threshold'); v@P.y = -abs(v@P.x - t) + t;
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