Fix perspective camera #2016
Open
Fix perspective camera #2016
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
In a perspective projection matrix, the bottom-right element must be 0 to ensure correct perspective division.
|
|
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
In a perspective projection matrix, the homogeneous coordinate w must depend on z (depth) to enable correct perspective division.
This ensures objects farther from the camera appear smaller and depth is properly mapped.
I found a useful resource explaining this in detail, which you can check here:
https://www.scratchapixel.com/lessons/3d-basic-rendering/perspective-and-orthographic-projection-matrix/opengl-perspective-projection-matrix.html
The issue with
wis explained in the beggining of the article.In the attached GIF, I demonstrate the issue with a 3D scene - although it looks like the camera is rotating around the origin, the real problem lies in the incorrect perspective projection formula.