fix: position the bar above the horizontal center

[5tr1k3r]

Resolves #24

This is what it looks like after the change:

[5tr1k3r]

Nope, that actually seems wrong if the object is rotated. Looking into it further.

[5tr1k3r]

Nope, that actually seems wrong if the object is rotated. Looking into it further.

Seems like this happens with the original code as well: the health bar rotates with the object. I thought it would act more like a billboard.

[sparten11740]

I thought it would act more like a billboard.

yeah it's supposed to, good find

[sparten11740]

We may have to rethink the offset. With the changes in this PR, dual bars would overlay each other when viewed top down. In the multi-bar scenario, the bars' positions shouldn't change relative to each other even when the camera is rotated/tilted

[5tr1k3r]

Yes, I've noticed that too. If viewed directly top down, they will overlap. But if there is a small angle (which is typical even in something like an RTS), and the bars have different offsets (heights), then they are both seen fairly clearly:

[sparten11740]

what do you think about having the offset supplied as a vec3 instead of f32, where the components are applied as follows:
if the camera view vector is parallel to an axis (such as top-down for the y-axis), the corresponding component in the offset vector is applied 0% (not at all). If it's orthogonal, it is applied a 100% (i.e. front view for the y-axis). You could then specify 0 for the z component of the offset vector and in your case and in the top down view the bar would be centered.

(every angle in between orthogonal/parallel would be a percentage of the rotation, i.e. 45 degrees would be 50%)

[5tr1k3r]

It's hard for me to say without playing around with it :)