constrain objects y value

[ThE_JacO]

get a triangle (curve or poly) and make a cluster out of all its points.
now constrain a Null to that cluster.
shrink wrap the triangle to the surface

this will make the object constrained to the cluster to always follow the average of all the points, in the case of a triangle this basically gives you a follow surface system with an approximation threshold of value:
threshold = radius of the circle the triangle is inscribed in.

make the sphere child of the null, constrain it, use expressions... whatever, the null can drive any parameter you want across the surface while you move the triangle.

there are other ways too, but this is pretty straightforward, doesn't require scripting and still gives a good degree of control.

[morgn]

im hearing ya!
thanks v much

morgn.

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