rotation and scaling of profile along curve according to curve ;)

hey! actually the title says everything. i want to scale and rotate a profile along a rail-curve. scaling and rotation should be according to two graphs or curves. i attached some good old painting. would be nice if i could have some hints. i bet its easy but im a bit slow catchin on the whole thing.
next step would be a kind of distortion of both suface endings ( the surface desircbed by profile sweep). is there some way of making parametric surface -wrinkles (maybe random) in grasshopper, just on a certain area- i think i did something similar in cinema4d, but in rhino?
as always sorry for broken english and thanx in advance.
michael

Attachments:

grash.bmp, 949 KB

Replies to This Discussion

Permalink Reply by Damien Alomar on April 22, 2010 at 11:43am

See if the attached helps. At this moment, you have to pretty much do each operation (orient, scale, rotate) individually. You can define the base plane and point for the profile however you wish, I just used the Planar component. I just have some quick methods in there for determining the rotation values and the scale values, but replace those with what you need.

Attachments:

Ro+Sc_AlongRail.ghx, 145 KB

Permalink Reply by michael b on April 23, 2010 at 5:48am

hey damien, thx for your reply. i tried not to look at your file- made some approach for myself but your file was some kind of revelation- i addapted a few things and its definitly goin in the right direction now.
i have some problem now, distorting the brep. as i cant convert the brep into some mesh or surface and extract the uv points i was thinking about manipulating the profilcurves themselves.
i thought about dividing the profile curves and moving divisionpoints with random vector orthogonal to the loft surface or brep (im trying to get those vectors but it aint working right now). i tried it with rotationalong z-axis throug profile plane, but thats not the way i intended it to be. but i m not sure if this approach makes sense.
would be nice for another hint- if theres a possibility to manipulate the loft by transforming it into mesh and random-move meshpoints or if its better to manipulate the profilecurves-
the result differs i know... but first of all i would love to get a result- id actually prefer the mesh-manipulating way- (thats what reminds me of C4d workflow)

anyway thanx for help- this is a great community
hope i can be a part of the helping instead of the asking members soon :D

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