Dyn. alloc 2 dim float array not same as float[4][4]??

HellRiZZer · 2001-11-20T19:58:35

I was recently trying to make a 2 dim array for use with glMap2f(OpenGL) and making all its values same as the array float[4][4][3]. E.g I made typedef float glVertex3fv[3]; Then, I do: glVertex3fv **Grid; Then I allocate 2 dim array as 4x4 Grid = new glVertex3fv*[4]; for (int i=0;i<4;i++) Grid = new glVertex3fv[4]; And here I just assign all values of float[4][4][3] to Grid[x][y][0,1,2]. When I go to glMap2f and pass it not as &float[0][0](starting array value), but as (float *)&Grid[0][0], it draws some buggy things, not the patch I had with float[4][4][3].. Why? Someone help please? Thanks.

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Started by HellRiZZer November 18, 2001 08:03 PM

9 comments, last by HellRiZZer 23 years, 3 months ago

Null and Void

1,088

November 20, 2001 07:58 PM

Yes. Also, both of those arrays are consecutive. Another example:

var[num_vertex][3];
[Memory Internal][[0][1][2]][[0][1][2]]...

var[num_vertex*3];
[Memory Internal][0][1][2][4][5][6]...

It''s only ''sparse'' like I displayed if it (the second dimension, actually) is dynamically allocated. OpenGL _only_ takes single dimension consecutive arrays for vertex arrays

(with some exceptions, but that''s the default).

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Dyn. alloc 2 dim float array not same as float[4][4]??

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Dyn. alloc 2 dim float array not same as float[4][4]??

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