GLSL built-in function
determinant()
Returns a square matrix determinant, measuring signed scale.
Demo version: GLSL ES 3.00 / WebGL 2Demo stage: Fragment
Syntax
float determinant(mat m)Parameters
- m
- Input declared in the signature; match its type and dimensions
Return value
One float containing the determinant of the square matrix m; zero indicates a singular matrix.
Live example
Edit the code and the preview updates as you type.
What determinant does
Returns a square matrix determinant, measuring signed scale.
Read the preview
For mat2(x,0.0,0.0,y), the determinant is x*y, so opposite quadrants share colors. Replace y with 1.0 to make the result depend only on horizontal position.
Core call
determinant(mat2(x,0.0,0.0,y));
Zero means singular; a negative result indicates orientation reversal.
Experiment
Change mat2(x,0.0,0.0,y) to mat2(x,1.0,1.0,y). The determinant becomes x*y - 1, shifting the color range toward its lower end.