How do you do this...

I think what you''d normally do is specify the height for each point on a grid, then use the points to generate triangles to render. That way, each triangle is automatically welded to it''s surrounding ones.

E.G

.-.-.-.-.-.
.\.\.\.\.\.
.\.\.\.\.\.
.\.\.\.\.\.
.-.-.-.-.-.

Well, that doens''t really look too good, but basically, each . has a height, and your triangles are constructed between all the .s

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each pixel in the height map represents a vertex like:

pixel[x, y] = height; so the vertex is:

V(x * horizScale, height * verticalSCale, y * horizScale);

thus for a 2^n patch of triangles you need a 2^n + 1 heightmap

So to create a one tile terrain, you''d need a heightmap with 4 pixels, not just one. Interesting.

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shurcooL`

Yep.

And to save you time, if you want a map x tiles across and y tiles high, you will need (x+1)*(y+1) vertices. To find the height of an object in the middle of the tile, I just find the average of the four heights.

quote:

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Original post by shurcool
So to create a one tile terrain, you''d need a heightmap with 4 pixels, not just one. Interesting.

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shurcooL`

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Being sarcastic huh? Well at the moment my engine needs only one pixel. But i''m beginning to believe the per vertex approach mentioned here makes more sense. Any comments?
-CProgrammer

quote:

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Original post by CProgrammer
But i''m beginning to believe the per vertex approach mentioned here makes more sense. Any comments?
-CProgrammer

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You are correct sir!

1 pixel -> 1 vertex.

quote:

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Original post by CProgrammer

quote:

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Original post by shurcool
So to create a one tile terrain, you''d need a heightmap with 4 pixels, not just one. Interesting.

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shurcooL

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Being sarcastic huh? Well at the moment my engine needs only one pixel. But i''m beginning to believe the per vertex approach mentioned here makes more sense. Any comments?
-CProgrammer

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No, actually, I''m not. I just never thought about this before, and found it neat.

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shurcooL