Hi All,
My trig maths is awful ! to the point I cannot seem to replicate what I can do in SOPs . I have built a vop sop and try to replicate in the scene what an attribute SOP is doing. In this case a simple sin wave with a frequency and amplitude < no sure in VOP sops why I could get inverted values. Any ideas


Rob

that's because sin() expression takes degrees and Trig VOP radians
so just append Degrees To Radians VOP after Frame

the expression takes degrees, the vop radians, at least it looks like
edit: too slow,

Hi Tomas,
Thanks for the tip, thats one for the note book without doubt. Part 2 of my question because it interests me and Im sure others, sin() is values between -1 and 1 . So if I have values that currently go from -2 to 2 is there a way to move the range to positive numbers without the clamping. I thought fit(sin($FF*12)*2,-2,2,0,4) would do that job. Its been so long since messing with numbers I have done a quick refresher and got something working

Always helps to visually drive something with values ! . fixed scene attached for others to look at


Rob

that's correct fit(sin($FF*12)*2,-2,2,0,4) will rescale -2..2 range to 0..4
and since sin()*2 has limits at -2,2, it will not be clamped

but in that case multiplying sin() by 2 is redundand
so you can just use

fit11(sin($FF*12),0,4)

fit11() will assume source range is -1..1, which for sin() is correct

Hi Tomas,
Gold answer

Rob