playcanvas / playcanvas/engine
Incorrect Particle Rendering in Front of Transparent Canvas
Nobody has claimed this yet.
- Dominant language
- JavaScript
- Stars
- 16.8k
- Forks
- 2k
- Avg merge
- 4h 32m
- Merged PRs (30d)
- 222
Description
If you use a particle system with a transparent canvas, the particles render with some sort of additive or multiplicative action with the background color. This is particularly noticeable in AR applications (e.g. using 8th Wall).
Particles that appear in front of geometry are rendered as expected.
I have created an example project showing how they appear in front of black and white geometry compared to the transparent area. This is not an AR project, obviously, but the effect can still be seen.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the issue in the linked example project, focusing on particle rendering over transparent canvas areas and comparing it with rendering in front of black and white geometry. Done means particles render correctly without the reported additive or multiplicative effect over transparency, including the AR-related case described.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- computer-graphics
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100