FWIW,
I am simply taking the data from the xml file and copying it and then
pasting into an array.
I am not doing a automatic read or anything. One thing which puzzles
me is the number of vertices
in the file.
For instance, a rectangle has six sides. If you use two triangles to
draw each side
that is 6 sides * 2 triangles per side for a total of 12 triangles.
This agrees with .xml file
which says says there are 12 triangles.
>From the xml file:
<triangles count="12" material="Material2">
<input offset="0" semantic="VERTEX" source="#ID7" />
<p>0 1 2 1 0 3 4 5 6 5 4 7 8 9 10 9 8 11 12 13 14
13 12 15 16 17 18 17 16 19 20 21 22 21 20 23</p>
If you use 3 coordinates for each vertice of a triangle and a triangle
has three vertices,
then you have 3 * 3 *12 = 9*12 = 108 values of x, y, and z.
However the xml file has 72. From the xml file:
<float_array id="ID8" count="72">22.62976164142344
29.52755905511811 0 0 0 0 0 29.52755905511811 0 22.62976164142344 0 0
22.62976164142344 0 13.77952755905512 0 0 0 22.62976164142344 0 0 0 0
13.77952755905512 0 29.52755905511811 13.77952755905512 0 0 0 0 0
13.77952755905512 0 29.52755905511811 0 0 29.52755905511811
13.77952755905512 22.62976164142344 29.52755905511811 0 0
29.52755905511811 0 22.62976164142344 29.52755905511811
13.77952755905512 22.62976164142344 29.52755905511811 0
22.62976164142344 0 13.77952755905512 22.62976164142344 0 0
22.62976164142344 29.52755905511811 13.77952755905512
22.62976164142344 0 13.77952755905512 0 29.52755905511811
13.77952755905512 0 0 13.77952755905512 22.62976164142344
29.52755905511811 13.77952755905512</float_array>
So I am thinking it does not draw individual triangles using
GL_TRIANGLES mode. Instead it uses
GL_TRIANGLE_STRIP or GL_TRIANGLE_FAN mode where it is sharing vertices.
I'm not sure though.
Maybe my math is wrong, but if you share triangles the number of verts
required is verts' as this table shows.
Triangles Verts Verts'
1 3 3
2 6 4
3 9 5
4 12 6
5 15 7
6 18 8
.... verts' = tri+2
12 36 14
and 36*3 = 108 values
but 14*3 = 42 values not 72
John
On Thu, Oct 27, 2011 at 10:22 AM, J Handal <jhand...@gmail.com> wrote:
>
> I think is error is due to an incompatible file extension .dae file,
> AFIK android use .obj files with android(and other extensions??) but
> not Collada files.
>
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