This is the problem. the rendering is being done by another guy, who isnt going to be around much over the next week.
So given the orientation how do i caluclate the heading? Is there a formula, or some algorithm?
Caluclating a characters heading
Quote:So given the orientation how do i caluclate the heading? Is there a formula, or some algorithm?How to compute the forward direction vector depends on how the orientation is represented, so...how is the orientation represented? A matrix? A quaternion? Euler angles? Spherical angles? A set of basis vectors? A single 'heading' angle?
If you can tell us that, we can tell you how to get the forward direction vector.
Quote:Original post by kiniportDepending on what exactly is meant by 'heading' (which I'm not sure the OP has clarified), it's not a given that an object's heading vector will be aligned with its velocity vector.
heading=normalize(velocity)
or,
heading=normalize(destination-current_position)
That said, the problem as presented isn't really very clear, so who knows, maybe the answer you've given is exactly what the OP is looking for...
Quote:Orientation is a single heading angle.Ok, then if by 'heading' you mean 'forward direction vector', it would be computed as follows (assuming +z is up - you'll need to adjust accordingly if another axis is considered to be the 'up' axis):
forward.x = cos(heading_angle);forward.y = sin(heading_angle);forward.z = 0;
Author
Yes that is what im looking for. Sorry i didnt make it clearer. You're a hero mate. Really appreciate it.
Author
Im just wondering what the maths behind these adjustments is. I ask cos, here you are saying z is the up. In mine the y will be up and im wondering how i work out what sin/cos to use?
Quote:Original post by discodowneyCheck out the Wikipedia article on the unit circle for more info.
Im just wondering what the maths behind these adjustments is. I ask cos, here you are saying z is the up. In mine the y will be up and im wondering how i work out what sin/cos to use?
As for adjusting for y up, you simply need to swap and/or negate the sine and cosine terms as appropriate to get the results that you want. However, if the simulation is basically 2-d with 3-d graphics, I'd recommend making z up, as it'll make things easier overall.
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