Welcome to lab, which is a place where you and your peers complete exercises designed to help you learn the ideas discussed in the preceding lectures. It is intended to be a time where you encounter holes in your understanding and talk out loud with your peers and instructor.
Your instructor will bounce around between breakout rooms to check in with you. However, you are encouraged to request assistance if you find your progress blocked.
Designate one of your group to be the host. This individual will be responsible for setting up a Live Share session in Visual Studio Code and submitting your work. No team member should dominate or be expected to carry the group. All members should be writing code and contributing ideas.
Host, follow these steps:
Non-hosts, join the session.
Your task in this lab is to add a camera to your library of graphics repertoire and to explore a mechanism for animation in JavaScript. Follow these steps to complete this lab:
Camera
class in camera.js
. Focus on the constructor and orient
. If you finish early, come back and implement strafe
, advance
, yaw
, and pitch
.Camera
to one of your renderers. Keep the object centered at the world’s origin. Place the camera somewhere else, looking at the origin.clipFromEye
and eyeFromModel
.setFromTo
method to the camera that can be used to reposition and redirect the camera. Have it behave similar to the constructor, computing the camera’s forward vector. Assume the world’s up vector hasn’t changed.setFromTo
method. Follow this general pattern in your renderer to animate: function someEventHandler(event)
// ...
if (doesEventTriggerAnimation) {
requestAnimationFrame(animateFrame);
}
}
function animateFrame() {
// update state
render();
if (isStillAnimating) {
requestAnimationFrame(animateFrame);
}
}
setTimeout
and setInterval
. Unlike these other other functions, animation requests scheduled through requestAnimationFrame
will be paused when the browser is in the background or the tab is not visible.camera.js
on Crowdsource. Enter the eIDs for your team members. If you need to make changes after you’ve already submitted, just reload the page and resubmit. If you haven’t finished by the end of the scheduled lab time, you are free to continue working. However, the submission must be made before the end of the day to receive credit.
Comments