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+--- Thread: understanding brush dynamics (angle jitter) (/Thread-understanding-brush-dynamics-angle-jitter)
understanding brush dynamics (angle jitter) - Espermaschine - 12-14-2017
I want an arrow that wiggles a little bit, as i drag the brush along.
Im not sure i understand the dynamics curves fully....
So on the left side i have 'Angle' and on the right side 'Randomness', right ?
But when i turn up 'Angle', the arrows wiggle to the right and when i restrict 'Randomness', they wiggle to the left.
What is the logic behind this ?
[attachment=1110]
RE: understanding brush dynamics (angle jitter) - Blighty - 12-14-2017
Each little square represents 45 degrees (360/8)
First example, angle varies from 315 to 360
Second, angle varies from 0 to 45
Third, angle varies from 135 to 225
If you want arrows as per third example, but upright, then start with an upside down arrow.
RE: understanding brush dynamics (angle jitter) - Ofnuts - 12-14-2017
"Random" goes from 0.0 tà 1.00 (or read it as "min" to "max"). The Angle scale goes from min to max too, that is, 0 to 360°. Catch: the middle position is 180°, so the brush is upside-down! Obviously the angle is the "trignometric" angle, which is counter-clockwise. So, top to bottom:
- The angle is constrained to 340-360°, so the same as -20°-0° CCW, which is 0°-20° clock-wise.
- The angle is constrained to 0°-20° CCW, so the same as -20°-0° clock-wise.
- The angle is constrained to 170-190° so more or less upside-down.
So yes, having the brush wiggle a bit around its "upright" position requires a very contrived curve, and its better to use an upside down brush:
[attachment=1112]
[attachment=1111]
Changing the angle range from -180° to +180° has already been suggested.
RE: understanding brush dynamics (angle jitter) - Espermaschine - 12-14-2017
A-ha !
Once you understand that each square represents an eighth its getting easier !
Is there a specific design reason for eight squares, instead of ten (which would be easier to calculate) ?
Fine tuning the wiggle seems very difficult....what if i want it at half a square...when i do that, a bit of the graph is off the diagram.....
[attachment=1113]
Also, what does this type of curve mean ?
[attachment=1114]
RE: understanding brush dynamics (angle jitter) - Blighty - 12-14-2017
(12-14-2017, 12:01 PM)Espermaschine Wrote: Also, what does this type of curve mean ?
Left half of curve:
50% of your arrows will be random 0 to 360
Right half:
This only has 360 degrees. Remaining 50% of arrows will be upright.
RE: understanding brush dynamics (angle jitter) - Espermaschine - 12-14-2017
some aspects of these curves blow my mind a bit...
EDIT:
a-ha ! i get it - the curve is only applied to half of the diagram