# acc

## accelerated change

May appear as an option in all commands involving a variation.
## acc

### acc(x)

Returns **1.0 + sin(x * PI/2 + 3.0 * PI/2)**
## acc image

### acc image(id)

Returns the accelerated image **id**.

**Notes:**

1) The image **id** must be of a dynamique type.

2) This image is automatically calculated and there after the calculation of the dynamic.

3) For large images this command may give an error (overflow).
## acc line

### acc(v)line(w)

Returns the acceleration of the line **w**.

**v=1 w=x1, x2,... **

**v=2 w=x1,y1, x2,y2, ... **

**v=3 w=x1,y1,z1, x2,y2,z2, ... **(default).
## acc rota

### acc rota vol(id)

Returns the rotation vector accelration instantaneous volume id.
## acc som

### acc som(s) vol(id)

Returns the acceleration of vertex s of the volume **id**.
## acc mouse

Returns the acceleration of mouse with mode 2.
## acc stock

### acc stock(id)

Returns the acceleration of the object
stock **id**.
### acc(num)stock(id)

Returns the acceleration vectors
**num** of the object stock **id**.
## acc vol

### acc vol(id)

Returns the acceleration of the center of gravity
of the volume **id**.
## See also: