Method constructor

examples/extern/gmath.bundle.js:1506–1512

(fovy, aspect, near, far)

    near;
    far;
    constructor(fovy, aspect, near, far){
        fovy = fovy.toRad();
        this.fovy = fovy;
        this.aspect = aspect;
        this.near = near;
        this.far = far;
    }
    toPerspective() {
        const angle = this.fovy.div(2);
        const ymax = this.near * angle.tan();