s + z + 5 to scale up box, ctrl + r to create 50 loop cuts
add deform modifier, twist in z 450 deg
add a circle curve, add curve modifier to twisted object
select circle as curve, in object property, scale up z until both end touch
ctrl + r to loop cut in middle of faces again
s + shift + z to scale inward, ctrl + b to bevel edges
alt + s to scale up bevel. ctrl + r to loop cut in middle of each face again
add subdivision modifier
add a uv sphere. download wood textures from ambientCG, apply in shading
add new particle system, select hair, select sphere as render object
source -> emit from vertices. disable random
find total vertices in model tab bottom statistic bar
change the emission number to the total of vertices
object data property, select bottom or top edge loop, assign it to a vertex group
particle property -> vertex groups -> density -> select assigned vertex group
press invert button beside. duplicate spheres are eliminated
reduce particle emission number by the amount in the bottom edge loop
particle property, check advanced, check rotation
increase randomize and phase. Each sphere has different rotation
render -> uncheck show emitter.
ctrl + a to apply scale before animation
shader tab -> add background image
set scale animation for circle curve and twist object
reference:
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