processing/processing

Shape with only two vertices won't draw (P2D and P3D, works with JAVA2D)

Closed

#5,270 opened on Sep 23, 2017

View on GitHubContributor guide
 (0 comments) (0 reactions) (0 assignees)Java (1,540 forks)batch import
help wantedlowopengl

Repository metrics

Stars
 (6,431 stars)
PR merge metrics
 (No merged PRs in 30d)

Description

Description

A shape with only two vertices in immediate mode won't render; it appears when adding a third vertex. This issue presents itself only with the hardware renderers.

Steps to Reproduce

void setup(){
  size(200, 200, P2D);
  noFill();
  stroke(0);
  beginShape();
  vertex(10, 10);
  vertex(100, 100);
  endShape();
}

Your Environment

Processing version: 3.3.6 Operating System and OS version: macOS 10.12.6

Contributor guide

Research direction
Examine the P2D and P3D rendering pipeline to see why a shape with only two vertices is not rendered. Compare with the JAVA2D implementation to find the difference.
Tech stack
java
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Processing basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65