Hi Jabiertxo,
There are various functions for this, the technical term is 'arc length', you can either compute a specific curves' total arc length (length), get an sbasis which maps time to arc length(arcLengthSb), or you can reparameterise a curve by arc length (arc_length_parameterization). There was an inverse arc length to time function somewhere too, but I can't remember what it's called.
I think the easiest way to get what you want is roots(arcLengthSb(B) - desiredLength) which will return all the positions on B that are desiredLength from the start.
njh
On Mon, May 19, 2014 at 08:59:19PM +0200, Jabiertxo Arraiza Cenoz wrote:
Hello again. Thanks to LiamW i undertand the time in bezier curves is influenced by his curvature. Now i have a problem i want to select a time value at specific distance. Is posibol actualy?
Thanks, Jabier.