Intersection point of a surface with a curve

[ludde3d]

Hi Everybody,

i want to calculate the intersection point of a surface with a curve. Perhaps i've missed a simple solution to do this and you've got some hints for me.

My current aproaches:

• My first stupid solution: Calculate the intersection curve of two nurbs surfaces (Edit NURBS -> Intersect Surfaces). One NURBS is a thin cylinder to simulate the linear curve. Duplicate the resulting surface curve and center the pivot. The resulting point is the intersection point (more or less). This solution works fine as expression BUT i don't get informations about the normals of the object and it's not really fast.

• 2nd aproach: To get the normal information of the intersection point at the surface i thought it would be good to use the geometry and normal constraint. But i don't know how to calculate the intersection with a defined linear curve. Any ideas?

Thanks,
David

[joojaa]

well you culd modify things a bit

My first stupid solution: Calculate the intersection curve of two nurbs surfaces

Ok this works, instead of a small tube tough make the surface a simle extrude of a line thet starts at your curve. Thsiway you can jsut ask for the location of the vertex 0. Should save you some nodes.

BUT i don't get informations about the normals of the object and it's not really fast.

But the normal has nothing to do with your question that is a difrferent ballgame alltogether, Just feed the uv position to a surface info node.

i don't know how to calculate the intersection with a defined linear curve

ahh so the curve is linear. In thatcase you should try to use the ray intersect plugin.

[ludde3d]

cool. thanks a lot for your reply.

i've developed a second setup where i use a locator with a geometry constraint to the surface. This locator is parented to another locator animated along the curve (motion path). then i searched iterative for the minimum distance between the two locators. this solution was a little bit more effective than my first try but i think it's still too slow.

i will try using the plugin. it sounds promissing.

[joojaa]

Just otr of curiosty what shape ARE the surfaces in question.