rotate3d()
Quick Summary for rotate3d()
rotate3d() CSS function defines a transformation that rotates an element around a fixed axis in 3D space, without deforming it. Its result is a <transform-function> data type.
Code Usage for rotate3d()
rotate3d(x, y, z, a) More Details for rotate3d()
rotate3d()
The rotate3d() CSS function defines a transformation that rotates an element around a fixed axis in 3D space, without deforming it. Its result is a <transform-function> data type.
In 3D space, rotations have three degrees of liberty, which together describe a single axis of rotation. The axis of rotation is defined by an [x, y, z] vector and pass by the origin (as defined by the transform-origin property). If, as specified, the vector is not normalized (i.e., if the sum of the square of its three coordinates is not 1), the user agent will normalize it internally. A non-normalizable vector, such as the null vector, [0, 0, 0], will cause the rotation to be ignored, but without invaliding the whole CSS property.
Note: Unlike rotations in the 2D plane, the composition of 3D rotations is usually not commutative. In other words, the order in which the rotations are applied impacts the result.
Syntax
The amount of rotation created by rotate3d() is specified by three <number>s and one <angle>. The <number>s represent the x-, y-, and z-coordinates of the vector denoting the axis of rotation. The <angle> represents the angle of rotation; if positive, the movement will be clockwise; if negative, it will be counter-clockwise.
rotate3d(x, y, z, a) Values
x Is a <number> describing the x-coordinate of the vector denoting the axis of rotation which could between 0 and 1.
y Is a <number> describing the y-coordinate of the vector denoting the axis of rotation which could between 0 and 1.
z Is a <number> describing the z-coordinate of the vector denoting the axis of rotation which could between 0 and 1.
a Is an <angle> representing the angle of the rotation. A positive angle denotes a clockwise rotation, a negative angle a counter-clockwise one.
| Cartesian coordinates on ℝ^2 | This transformation applies to the 3D space and can't be represented on the plane. |
|---|---|
| Homogeneous coordinates on ℝℙ^2 | |
| Cartesian coordinates on ℝ^3 | ( 1 + ( 1 - cos ( a ) ) ( x 2 - 1 ) z · sin ( a ) + x y ( 1 - cos ( a ) ) - y · sin ( a ) + x z · ( 1 - cos ( a ) ) - z · sin ( a ) + x y · ( 1 - cos ( a ) ) 1 + ( 1 - cos ( a ) ) ( y2 - 1 ) x · sin ( a ) + y z · ( 1 - cos ( a ) ) y sin ( a ) + xz ( 1 - cos ( a ) ) - x sin ( a ) + yz ( 1 - cos ( a ) ) 1 + ( 1 - cos ( a ) ) ( z2 - 1 ) t 0 0 0 1 ) |
| Homogeneous coordinates on ℝℙ^3 |
Examples
Rotating on the y-axis
HTML<div>Normal</div> <div class="rotated">Rotated</div> body { perspective: 800px; } div { width: 80px; height: 80px; background-color: skyblue; } .rotated { transform: rotate3d(0, 1, 0, 60deg); background-color: pink; } Rotating on a custom axis
HTML<div>Normal</div> <div class="rotated">Rotated</div> body { perspective: 800px; } div { width: 80px; height: 80px; background-color: skyblue; } .rotated { transform: rotate3d(1, 2, -1, 192deg); background-color: pink; } Specifications
| Specification |
|---|
| CSS Transforms Module Level 2 # funcdef-rotate3d |
See also
transform <transform-function> Last modified: Jan 31, 2022, by MDN contributors
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"Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn’t do anything. 'Are you feeling all right?' I asked her. 'I feel all sleepy,' she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was...in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. ...I dedicated two of my books to Olivia, the first was ‘James and the Giant Peach’. That was when she was still alive. The second was ‘The BFG’, dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children."
I just checked google books for BFG, and the dedication is there.
https://www.google.com.au/books/edition/_/quybcXrFhCIC?hl=en&gbpv=1
Roald Dahl, 1986
