Create geometry from texture/color in Houdini

Create geometry from texture/color

with attribute from map

add a grid add attribute from map node texture map: $HFS/houdini/pic/Mandril.rat (right click in file browser -> show images) add attribute promote node (to move Cd attribute from points to primitives) original name: Cd original class: point new class: primitive add poly extrude node divide into: individual elements distance: 2 local control tab -> distance scale: Cd

create round dots of a photo

(same effect as above but with round tubes) add tube add grid add attribute from map node texture map: $HFS/houdini/pic/Mandril.rat (right click in file browser -> show images) add attribute wrangle node v@P.y=v@Cd; or to invert the colors: v@P.y=1-v@Cd; add copy to points

with attribute adjust color

add a grid add uv unwrap node add attribute adjust color node pattern type: color map add attribute promote node original name: Cd original class: point new class: primitive add poly extrude node divide into: individual elements distance: 3 local control tab -> distance scale: Cd

with attribute adjust float

add a grid add uv unwrap node add attribute adjust float node attribute name: height attribute class: primitive pattern type: color map channel: R add poly extrude node divide into: individual elements distance: 2 local control tab -> +distance scale: height

separate object from background/green screen

(needs a photo with object + black background) top view -> press D -> background -> select image add a grid and scale it to the dimensions of the image rows: lots of columns: lots of add attribute from map node texture map: select image image settings tab -> check invert U add attribute promote node original name: Cd original class: point new class: primitive add blast node group: @Cd.r<0.02 group type: primitives (or use points and without attribpromote)

create curves from image with trace node

add trace node image input: select a photo threshold: adjust this check add point texture (to add UVs!) filters tab -> check hole faces boundary color: black/white/custom add planar patch from curves node (to convert curves to polygons) check resample curves interior edge length: 0.008 (or use remesh node instead) add attribute from map node (to get texture) map source: select the photo

create dots version of a photo

(needs a black and white photo, square format) add circle uniform scale: 0.05 add grid rows: 100 columns: 100 add uv unwrap node add scatter node generate: in texture space density scale: 10000 relax iterations: 1000 add attribute adjust float node attribute name: pscale pattern type: color map color map: select the black and white photo channel: R add copy to points node feed circle and attribadjustfloat (add another grid with black color)