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## #1 Re: Help Me ! » How to get the coordinate point from given distance... » 2006-03-21 19:27:02

oh ya, i means i wanna find the point which 3 or 10 distance from point A which have the same M of line from A to B.. thanks..

## #2 Help Me ! » How to get the coordinate point from given distance... » 2006-03-17 14:51:06

snyy
Replies: 2

i faced some problem with coordinate points, how can i get the points (x,y) with the given distance. For example, point A(-2,1) point B(1,5). The distance is 5. so, how am i going to get the point which distance is lets say 3 or 10 from point A?? thanks...

## #3 Re: Help Me ! » intersection between cubic curve... » 2006-01-24 19:13:00

i doing a application which can draw nurbs, find the intersection and fill the nurbs...

## #4 Re: Help Me ! » intersection between cubic curve... » 2006-01-23 14:45:23

yes, i know where is the control point of my curve (nurbs). so, anywhere to get the intersec point?  then how to get the intersec point of the normal cubic curve?

## #5 Re: Help Me ! » intersection between cubic curve... » 2006-01-22 13:11:38

yaya.. i want to know where 2 curve(Nurbs) cross each other. sorry, dont really get what you means. can explain futher to me ? thanks..

## #6 Help Me ! » intersection between cubic curve... » 2006-01-20 16:05:12

snyy
Replies: 8

hi.. anyone know what is the formula to get the intersection point between cubic curve(Nurbs)?
thanks..

## #7 Re: Help Me ! » Equation Problem.. t=?? » 2005-12-29 14:52:03

sorry, don't really understand how you do this.
can show me how you get this formula (-x0+3x1-3x2+x3)t^3 + (3x0-6x1+3x2)t^2 + (-3x0+3x1)t + x0 ??
from x0(1-3t+3t^2-t^3)  + 3x1 (t-2t^2+t^3) + 3x2(t^2-t^3) + x3t^3

## #8 Help Me ! » Equation Problem.. t=?? » 2005-12-29 13:10:31

snyy
Replies: 9

a = x0 * (1-t)³ + x1 * 3 * t * (1-t)² + x2 * 3 * t² * (1-t) +x3 * t³

if x0 = 138, x1=116, x3= 171, x4=198 while t=0.01
then a =137.934235

but for now, i want to find t, i have the all the value of x0,x1,x2,x3 and a. so how to reverse the formula so that i can find t??
thanks..