ortho()

Sets an orthographic projection for the current camera in a 3D sketch.

In an orthographic projection, shapes with the same size always appear the same size, regardless of whether they are near or far from the camera.

ortho() changes the camera’s perspective by changing its viewing frustum from a truncated pyramid to a rectangular prism. The camera is placed in front of the frustum and views everything between the frustum’s near plane and its far plane. ortho() has six optional parameters to define the frustum.

The first four parameters, left, right, bottom, and top, set the coordinates of the frustum’s sides, bottom, and top. For example, calling ortho(-100, 100, 200, -200) creates a frustum that’s 200 pixels wide and 400 pixels tall. By default, these coordinates are set based on the sketch’s width and height, as in ortho(-width / 2, width / 2, -height / 2, height / 2).

The last two parameters, near and far, set the distance of the frustum’s near and far plane from the camera. For example, calling ortho(-100, 100, 200, 200, 50, 1000) creates a frustum that’s 200 pixels wide, 400 pixels tall, starts 50 pixels from the camera, and ends 1,000 pixels from the camera. By default, near and far are set to 0 and max(width, height) + 800, respectively.

Note: ortho() can only be used in WebGL mode.