HGE

In response to a request in another thread, here's my early attempt at doing software 3d with HGE :) (perverse considering HGE is already 2d in 3d ^^)



This was an exercise in teaching myself the maths I should have picked up at uni but never really got to grips with at the time. Apologies for the lack of comments, commented out blocks & generally rubbish design.

Classes worth a mention:
AdvancedSprite - this is where the matrix math & rendering happens. Not the best place for it really - in later attempts this was moved out to its own utility class. There are also a few matrix math libraries around, it may be worth considering one of these :)

ObjectManager - Update() does some matrix manipulation to each sprite before rendering. Objects store the state of each sprite, data from which is passed to AdvancedSprite. Rather than keep a bunch of pointers to sprites around all the time I use a single sprite which is rendered multiple times & update it with each object's data. The idea being objects take up less space than full blown sprites, but there is a cost associated with initialising sprites on a per object basis. I haven't noticed a significant performance hit with this approach.

SortingAlgorithms - This is used to sort the rendering order of the sprites by Z depth. only std::sort at the moment but the design allows multiple sort algorithms to be plugged in & swapped between.

TextureManager: Virtually pointless at present, just saves me having to type HTEXTURE manually :)

last but not least (and not actually a class), MMGR. Great little memory manager from Fluid Studios

WinMain contains the setup code for the various objects in the scene.

Bugs:
- Zooming doesn't work for negative values of Z.
- Some of the marines at the back aren't spaced evenly in terms of Z depth, but they should be.

There's plenty of improvements to make to this project, but it's a start - I suspect there are subtle errors in the maths so if you spot anything let me know.

and finally..
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