The rotate3d() function is a 3D transform function that is used to rotate an element in three-dimensional space. 6f2r62

The element is rotated by an <angle> which is ed in as the fourth parameter of the function. The first three parameters specify the rotation direction, and together they form a direction vector [x, y, z] which is used to apply the rotation in the specified direction.

A positive angle value will rotate the element in the clockwise direction along the corresponding axis, and a negative value will rotate it in the counter-clockwise direction along that axis.

The clockwise direction is determined by looking at the vector starting from the end of the vector (where the pointing arrow usually is) towards the origin. The following image shows the positive (clockwise) direction of rotation along the three axes:

The first three parameters of rotate3d() will specify the direction vector along which the rotation will happen, and the angle will specify the direction: clockwise along the vector or counter-clockwise.

Examples:

transform: rotate3d(1, 1, 2, 45deg);

transform: rotate3d(2, 1, 3, 33deg);

transform: rotate3d(1, 0, 0, 45deg); /* element is rotated clockwise along the x-axis by 45deg */

transform: rotate3d(0, 1, 0, 45deg); /* element is rotated clockwise along the y-axis by 45deg */

transform: rotate3d(0, 0, 1, 45deg); /* element is rotated clockwise along the z-axis by 45deg */

transform: rotate3d(0, 0, 0, 50deg); /* NO ROTATION IS APPLIED */
                

The following image shows the result of applying rotate3d(1, 1, 1, 50deg); to an image:

The official syntax looks as follows:

transform: rotate3d( <number> , <number> , <number> , <angle> );
                

For a better understanding of the transform functions, please refer to the transform entry.