#REALLY smooth fly-thru!
25-Jan-94 18:16:37
Sb: #REALLY smooth fly-thru!
Fm: Marion K. Marks 70700,2777
To: David J. Marks 72172,1036
Once again, Compuserve's nasty habit of evaporating messages before I get a
chance to read them strikes. David J. Marks (no relation) quotes someone else,
saying only:
>>spath.kxp
>Bravo! I can't wait. Now if only my money tree grew a little faster. <g>
And I have no idea what this is about, other than the obvious:
someone (I have no way of knowing who) has proposed or is developing
a .KXP called SPATH, that presumably (based on the Subj: name of this
thread and also the name SPATH itself) helps smooth out Keyframer
paths. I'm very, very interested in this, but have no idea how to
find out more. 🙁
On the subject of Tension, Continuity, and Bias: it helps to
understand them better if you liken them to the control vectors of a
Bezier spline, such as is used in Illustrator, FreeHand, Corel Draw,
Canvas, and the like — as well as the 2D Shaper and 3D Lofter
modules of 3DS itself. I'll use 3DS to illustrate my point, since we
all have it:
Tension is related to the length of both vectors. Increasing Tension is the
same as selecting "Modify/Vertex/Adjust" in the 2D Shaper, and then pulling
both the red and yellow vectors out further (making the arrows longer) WITHOUT
holding down the [Alt] key. Decreasing Tension is the same as shortening the
arrows, again without holding the [Alt] key.
Continuity is related to the ANGLE of the vectors to each other. If
Continuity is 25, then the two vectors are in a straight line from each other.
Changing continuity is equivilant to doing a Modify/Vertex/Adjust while holding
down the [Alt] key so that only the yellow vector moves, and changing its
DIRECTION without changing its LENGTH. Moving it one way is equivalent to
increasing Continuity past 25 toward 50, while moving it the other way is
equivalent to decreasing Continuity past 25 toward 0.
Bias is related to the RELATIVE LENGTH of the vectors TO EACH
OTHER. If the Bias is 25, then the two vectors are the same length
(how long that is is determined by Tension). Increasing Bias is like
Modify/Vertex/Adjust, first decreasing both vectors' lengths without
changing their angle and without holding the [Alt] key, and then
holding down the [Alt] key while increasing the length of the yellow
vector to its original length (as it was before shortening it) and
then increasing it further by the exact same amount that you
shortened it before, without changing its angle. Reducing Bias is like
reversing that process, increasing both and then reducing the yellow vector, so
that the red has increased at the expense of the yellow.