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  Layer problem in tile-based map  (Read 1210 times)
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Offline ah_fook

Junior Newbie

Java games rock!

« Posted 2003-07-12 01:54:29 »

Hi, I am working with a tile-based engine now.  My engine consists of 3 layers: a ground layer(grasses, road, etc), an object layer(columns, house, etc), and a topmost layer(cloud, etc).  Also, each tile is 32x32 in pixels.

This is my first approach in rendering: ground layer => object layer => all sprites => topmost layer.  However, it comes up with some sprites standing "on the top of a tree" rather than standing "behind a tree" in this case.

Then I've tried the second approach: divding the object layers to 2 layers, and rendering sequence is now: ground layer => lower object layer => sprites => upper object layer => topmost layer.  I was satisfactory with the result until I have decided to use taller sprites (32x96px) instead of the original one(32x64px).  Now the head of my sprites is "cut off" by the upper part of trees Cry

So, should I divide the object layers into further more layers?  Or you genius here have other better solution?

Offline jbanes

JGO Coder

Projects: 1

"Java Games? Incredible! Mr. Incredible, that is!"

« Reply #1 - Posted 2003-07-12 02:14:14 »

Get rid of the "layers" scheme and just render in "ground => sprites" order. Make sure you render from the upper-left hand corner of the screen in a left to right, top to bottom fashion. In this way you'll end up with sprites "closer" to the viewer being on top. (BTW, things like trees need to be sprites in order to show up correctly. If you *need* them to be tiles, then you'll need to render ground and sprites simultaneously)

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Offline ah_fook

Junior Newbie

Java games rock!

« Reply #2 - Posted 2003-07-12 02:29:45 »

Thx for your helpful advice Grin

So, it's better to have a Vector or LinkedList to collect all the trees, house, characters, etc, and then apply sorting according to their z-depth before rendering?

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Offline jbanes

JGO Coder

Projects: 1

"Java Games? Incredible! Mr. Incredible, that is!"

« Reply #3 - Posted 2003-07-12 02:47:37 »

No, nothing about Z depth. What I said was that you need to render left to right, top to bottom. Assuming that higher is the -y direction, rendering in this order will force the proper Z order. Of course, I suppose you could use a sorting routine to (potentially) speed up rendering...

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Last Journal Entry: 12/17/04
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