AtoZ CSS Screencast: The rotateY CSS Transform

This tutorial explores CSS's rotateY transform, enabling 3D rotations around the Y-axis, perfect for effects like card flips. We'll also cover transform-style: preserve-3d for proper 3D rendering and the perspective and perspective-origin properties to control the viewing angle.

Key Concepts:

• rotateY: Rotates elements around their vertical (Y) axis. The angle (in degrees, radians, etc.) determines the rotation amount.
• transform-style: preserve-3d: Essential for creating realistic 3D effects. Applied to the parent container, it ensures child elements maintain their 3D positions instead of flattening.
• perspective: Simulates distance between the viewer and the element, influencing the 3D perspective. A higher value increases the distance, making the 3D effect less pronounced.
• perspective-origin: Sets the vanishing point, controlling the perspective's center. It takes two values: horizontal and vertical offsets.

Understanding 3D Space in CSS:

CSS operates within a 3D coordinate system (X, Y, Z). While z-index (discussed later) handles stacking order in the Z-plane, rotateY and other 3D transforms manipulate elements within this 3D space. transform-style: preserve-3d is crucial for visualizing these transformations accurately.

Rotation with rotateY:

rotateY() rotates elements around the Y-axis. Positive values rotate clockwise, negative values counter-clockwise. For example:

img {
  transform: rotateY(45deg);
}

Animating rotateY creates dynamic effects:

img {
  animation: spin 2s infinite linear;
}
@keyframes spin {
  from { transform: rotateY(0deg); }
  to { transform: rotateY(360deg); }
}

Note: Rotating 180° might show a mirrored image. Use backface-visibility: hidden; to control the visibility of the back face.

Perspective and Depth:

The perspective property on the parent container simulates viewing distance. perspective-origin adjusts the vanishing point. Example:

.container {
  perspective: 500px; /* Adjust this value for different perspective strengths */
  perspective-origin: 50% 50%; /* Centered vanishing point */
}

Combining rotateY, transform-style: preserve-3d, perspective, and animation creates compelling 3D effects.

Frequently Asked Questions:

The provided FAQ section adequately covers common questions about rotateY, including its usage, combination with other transforms, animation, browser compatibility, and unit types. No further expansion is needed here.

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