CesiumGS/cesium

Zoom is slower when close to a model

Open

#5,131 opened on Mar 20, 2017

View on GitHub
 (5 comments) (0 reactions) (0 assignees)JavaScript (3,324 forks)batch import
category - cameragood first issuetype - enhancement

Repository metrics

Stars
 (11,758 stars)
PR merge metrics
 (Avg merge 15d 12h) (23 merged PRs in 30d)

Description

Reported in the forum here: http://cesiumjs.org/forum.html#!msg/cesium-dev/C_OT9kB9RV8/-zlIMRjWCAAJ

Zooming is slower when the camera is close-ish to a model. Possibly not the proximity to the model, but the fact that the model is "in the center" of the view.

http://cesiumjs.org/Cesium/Apps/Sandcastle/?src=Hello%20World.html&label=Showcases&gist=a4bc90cb451cc3c997566e34a655c5ca

if you change the value of latOffsetin getPositionCentered() you will notice the difference.

Contributor guide

Research direction
Investigate performance regression near models. Profile the camera zoom operation and check for inefficiencies in frustum culling or bounding sphere computations.
Tech stack
javascript
Domain
computer graphics
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitJavaScriptBasic understanding of 3D graphics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40