lookAt3D
Canonical ID: scene3d.lookAt. Nederlands: kijkNaar3D.
Changes camera yaw (the left-or-right angle) and pitch (the up-or-down angle) to aim at an absolute world target, without moving the camera. The target must differ from the camera position; a coincident target is invalid. Pitch remains within [-89,89] degrees. The call does not create a persistent tracking relationship: if the object later moves, aim again explicitly.
See 3D words and camera rules.
Signature
lookAt3D(x, y, z)
Arguments
| Parameter | Type | Requirement |
|---|---|---|
x |
Number | Finite world coordinate, absolute value at most 10,000. |
y |
Number | Finite world coordinate, absolute value at most 10,000. |
z |
Number | Finite world coordinate, absolute value at most 10,000. |
Return value
None.
Example
# language: en
clear3D("black")
sphere3D("ball", 0.5)
position3D("ball", 2, 0, -3)
lookAt3D(2, 0, -3)
say aim3D(20)
draw3D()
Prints ball and aims the view toward it.
Notes and common mistakes
Use the function name for your source language. Its canonical ID is a shared documentation label; you do not type that ID as a call. Giving your own variable or function the same name can hide the built-in. Supply the documented arguments and value types. Pliro reports mismatches when checking can detect them, or when the call runs.
A host is the app or environment running your program. To see a drawing, it needs a renderer, the part that draws on screen. The command-line command pliro run shows text but does not draw these graphics. The host support table explains which effects work in the IDE, browser, native app, and phone preview. A native build reports an unsupported capability instead of leaving it out.
In 3D, +Y points up. Yaw is the left-or-right angle; at zero the camera faces -Z. The world holds at most 256 objects. Changes appear when you call draw3D. An invalid call leaves the world unchanged. Editing requires an existing object name; creating objects and removing an absent name are exceptions. Use the portable color names or hex codes; transparent colors are unavailable here. Version 1 of the phone preview’s communication format does not carry 3D scenes. See the 3D guide for the coordinate rules.
Related entries
clear3D · box3D · sphere3D · cylinder3D · position3D · Programming guides · Host support · Calls and arguments