konstantin magnus
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Everything posted by konstantin magnus
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Curvesect intersection points
konstantin magnus replied to guache's topic in General Houdini Questions
Feed all curves into the first input of 'intersection stitch' instead. -
Can't consecutively cut with knife sop
konstantin magnus replied to noc2's topic in General Houdini Questions
You can 'remote-control' and repeatedly call the clipping SOP with python verbs. -
UV map saturn rings in Mantra
konstantin magnus replied to Alexandre's topic in Lighting & Rendering
You can turn a wide grid into a ring using sine and cosine on the bounding box of the grid. That way you can also create UVs on the fly. float radius_inner = chf('inner_radius'); float radius_outer = chf('outer_radius'); vector bbox = relbbox(0, v@P); vector bbpi = fit01(bbox, -M_PI, M_PI); vector uv = set(bbox.z, bbox.x, 0.0); v@uv = uv; vector pos = set( cos(bbpi.x), 0.0, sin(bbpi.x) ); pos *= fit01(bbox.z, radius_outer, radius_inner); v@P = pos; saturn_rings.hipnc -
You could try to partition a grid and round its corners. network.hipnc
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L-Systems- are they actually used for anything?
konstantin magnus replied to art3mis's topic in General Houdini Questions
I havent really tried them yet myself. But from the tutorials I have seen they seem neither much natural nor particularly art-directable to me. So depending on what you are trying to achieve its probably more convincing to come up with a tailored system of your own. But I am curious to see what others will present! -
Welcome Harry, you could put a sine wave on the distance from each particle to the closest position on the rocks. zen.hipnc
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Hi Antoine, to pixelate a curve put a grid on top of it and remove primitives by their distance to the curves surface before removing shared edges with the divide SOP. if(xyzdist(1, v@P) > 0.01) removeprim(0, @primnum, 1); gridify_curve.hipnc
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Last time I looked into shading fluids it was done with a combination of surface hull and bubbles with nested dielectrics enclosing a uniform volume. Roughly like this: Why don't you publish your attempt so we have something more elaborate to start from? coke.hipnc
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A fit that takes the minimum maximum of a value instead of you providing it?
konstantin magnus replied to OdForest's topic in Scripting
You can see how this can be done here: -
You can feed one-dimensional noise in a random-function to get vertical stripes in COPs. COP_stripes.hipnc
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Btw: If you really want the tiles to flip one after the other, just set it to: clamp((($FF - 1) * 10) - ($PR * 180), 0, 180)
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You could split a grid into separate tiles using facet -> unique points and use the primitive node for rotations. clamp((($FF - 1) * 8) - ($PR * 10), 0, 180) in rotate Z for example.. $FF - 1 makes the rotation dependent on frame number, - 1 so it starts at zero instead of 1, * 8 for speed - $PR to get an time offset between primitives, * 10 to increase it clamp(x, 0, 180) to block primitives to start from negative angles (using 0) and 180 to avoid overshooting flip_tiles.hipnc
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Hi mani, you might find this useful, as well:
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Try the hole SOP (see attachment). And maybe look at this thread in case you need regular quads: extrude_2_curves.hipnc
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Why is the circle born with inverted normals?
konstantin magnus replied to anicg's topic in General Houdini Questions
I also find the decision unfavorable. But once you reverse the winding order the polygon will face positive axis directions. -
In my opinion this particular tutorial series is way too complicated and long-winded for beginners. In case you are just getting started with procedural modeling I would rather recommend Kim Goossens Youtube-Channel and the Gametutor website.
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Shadow and Sun Light Analysis
konstantin magnus replied to Hanys's topic in General Houdini Questions
Would anyone know a simple formula to very roughly approximate the sun path (or rather sun vector)? -
How to generate interior levels with modular pieces
konstantin magnus replied to el_fideo_rubio's topic in Games
Do you know about the polyexpand node? -
Hi Justin, in order to fill a voxel field with image pixels put this code in a volumewrangle after a volume node: vector bbox = relbbox(0, v@P); vector map = colormap(chs('image'), bbox.x, bbox.y); f@density = luminance(map);
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Resample Curve by N attribute
konstantin magnus replied to philpappas's topic in General Houdini Questions
Hi philpappas, to extract main features of your curve you could first measure its curvature with the new measure SOP or by calculating the dot product of your tangents (see attachment). Afterwards a derivation of the curvature might be useful to only keep "break points" that are important to the visual appearance of your curve. I just would not know how to calculate this though. curve_curvature.hiplc -
Hi Niels, I tried the torus route as suggested on twitter: float r_torus = chf('radius_torus'); float r_tube = chf('radius_tube'); float freq = chf('frequency'); v@pos_rest = v@P; vector bbox = relbbox(0, v@P) * M_TWO_PI; v@P.x = (r_torus + r_tube * cos(bbox.x)) * cos(bbox.z); v@P.y = (r_torus + r_tube * cos(bbox.x)) * sin(bbox.z); v@P.z = r_tube * sin(bbox.x); v@Cd = noise(v@P * vector(freq)); v@P = v@pos_rest; seamless_noise.hip
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Yes, you could take the convertline SOP, promote the wave attribute to primitives and delete by this attribute. @DévinOdforce: I attached an example. dashed_curves_prims.hiplc
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Let a sine wave run across your curves, set the dash length with frequency, animate by adding time and define the gap size by comparing the value with a custom threshold. float u = vertexprimindex(0, @vtxnum) / float(primvertexcount(0, @primnum)); float u_length = u * primintrinsic(0, 'measuredperimeter', @primnum); float u_anim = (u_length + @Time * chf('speed')); int waves = sin(u_anim * M_PI * chf('frequency')) < chf('gaps'); v@Cd = hsvtorgb( set(u, 1.0, 1.0) ) * waves; If you want your dashed line to be static just replace u_anim inside the sin() function by u_length. dashed_curves.hiplc
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A good way for making grid divisions depend on pixel resolution
konstantin magnus replied to Jaanus's topic in General Houdini Questions
On a grid-node just right-click in order to switch the expression language to Python and use this:- 2 replies
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Orient noise pattern along vectors
konstantin magnus replied to konstantin magnus's topic in Scripting
Great idea @f1480187, creating the rotation matrices from the cage lines is definitely cleaner!