update method
void
update()
Implementation
void update() {
final mesh = children[0];
if (color != null) {
material?.color.setFrom(color!);
} else {
final colors = mesh.geometry!.getAttributeFromString('color');
_color1.setFrom(light.color!);
_color2.setFrom(light.groundColor!);
for (int i = 0, l = colors.count; i < l; i++) {
final color = (i < (l / 2)) ? _color1 : _color2;
colors.setXYZ(i, color.red, color.green, color.blue);
}
colors.needsUpdate = true;
}
mesh.lookAt(_vectorHemisphereLightHelper
.setFromMatrixPosition(light.matrixWorld)
.negate());
}