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CSS CSS - Beyond the Basics CSS Animation Basics Full-Page Animation Project: Part 1

Why did Guil use rotateZ and not a normal rotate? For the GPU acceleration boost?

Guil uses rotateZ for rotating the steam. I wonder why he is using a 3D transformation although we are working in a 2D space. Only for the GPU boost? By what exactly does that get triggered? Is using the 3D transform functions always better?

2 Answers

Codin - Codesmite
Codin - Codesmite
8,600 Points

There is no difference in what they do, they both rotate on the z axis. But I believe rotateZ does trigger hardware acceleration in webkit browsers as it utilizes the GPU instead.

For example you can actually trigger hardware acceleration on 2D transforms by including a 3D transform even if the value is set to 0.

#example{
   transform: rotate(90deg) translateZ(0);
}

The above code would trigger hardware acceleration due to translateZ();

This allows you to have a 2D rotate that is backwards compatible with browsers that do not support 3D CSS transforms. and also at the same time enable hardware acceleration in browsers that do. translateZ(0); will not break the rotate in browsers that are not compatible with 3D Transforms.

You can do this with any of the 3D CSS transforms:

    translate3d()
    translateZ()
    scale3d()
    scaleZ()
    rotateX()
    rotateY()
    rotate3d()
    perspective()
    matrix3d()

Sweet, that's what I thought. Thanks for clarifying, Ashley!