2

Hey guys I'm new to Blender. I don't know about Sine function in Math Node. Blender's official manual redirects me to the Wikipedia page but in there I don't understand the process. I want to know how to predict the output of the sine function and how it works in Blender.

Harry McKenzie
  • 10,995
  • 8
  • 23
  • 51
Anim goggles
  • 83
  • 8
  • 3
    Do you know sine from elsewhere? The sine function is exactly like any other sine function: sine(theta) is the Y coordinate of a unit vector as it rotates about the origin by theta radians in an XY coordinate system, starting at 0 radians for a 1,0 +X vector. So the sine of 0 is 0; the sine of pi/2 (90 degrees) is 1 (vector rotated 90 degrees is at 0,1); sine of pi/4 is 2^0.5/2. – Nathan Aug 17 '22 at 05:38
  • maybe you have written your question a bit unfortunate...but as Nathan wrote and understood it - your questions sounds like you don't know sin function at all...and if so - than you should post your question in a math forum, not here – Chris Aug 17 '22 at 06:56
  • Thank you Chris and Nathan for your support. – Anim goggles Aug 17 '22 at 07:00
  • I think the OP was just confused on why for example sine(90) would not return 1 as he might have expected. He probably expected the inputs to be degrees but didn't know that Blender's trigo functions use angles in radians instead of degrees – Harry McKenzie Aug 17 '22 at 07:06
  • @HarryMcKenzie: that's why he should improve/edit his question to make it clear what exactly his problem is...it's pretty vague so...‍♂️ – Chris Aug 17 '22 at 08:29
  • agreed. that's why i voted to close XD – Harry McKenzie Aug 17 '22 at 08:46

2 Answers2

1

This plane is slightly wider than 2pi, slightly deeper than 2. It's mapped in its Object coordinates. Its object-origin is at its centre.

enter image description here

The Math > Sine node returns the sine of its input, where the input is in radians.

Robin Betts
  • 76,260
  • 8
  • 77
  • 190
1

Sine outputs a number from -1 to 1. You can use the Map Range node afterwards to convert it to any range you want.

To ensure your animation loops seamlessly, add a Map Range node before the sine that outputs 0 to 2*pi (you can actually type pi in the max value box and it will accept it).

Richard
  • 340
  • 6
  • 16