Re: [PyOpenGL-Users] size limit of vertex array?

[Alejandro S. <as...@gm...>]

Hi Roland,

I completely agree with Ian on this one. glDrawArrays seems more appropriate
for the way you are composing your arrays. IMO, this should not be setting
any constraints on how many vertices you can supply to the GL tough.

How much RAM does your video card have?

Alejandro.-

On Tue, Jul 13, 2010 at 1:22 PM, Ian Mallett <geo...@gm...> wrote:

> My recommendation: use glDrawArrays(...).
>
> #Init:
>
> self.vertices = []
> self.normals = []
> self.nbrindices = 0
> unit = 1.0
> y = 0.0
> rows = 2
> columns = 8
> z_center_delta = unit * (float(rows) / 2.0)
> x_center_delta = unit * (float(columns) / 2.0)
> for i in range(rows):
>     delta_z = (unit * float(i)) - z_center_delta
>     for j in range(columns):
>         delta_x = (unit * float(j)) - x_center_delta
>         self.vertices += [[0.0 + delta_x, y, 0.0 + delta_z],
>                           [0.0 + delta_x, y, unit + delta_z],
>                           [unit + delta_x, y, unit + delta_z],
>                           [unit + delta_x, y, 0.0 + delta_z]]
>         self.normals += [[0.0, +1.0, 0.0],
>                          [0.0, +1.0, 0.0],
>                          [0.0, +1.0, 0.0],
>                          [0.0, +1.0, 0.0]]
>
> #Draw:
> glPolygonMode(GL_FRONT_AND_BACK,GL_LINE)
>
>
> glEnableClientState(GL_VERTEX_ARRAY)
> glEnableClientState(GL_NORMAL_ARRAY)
>
> glVertexPointer(3, GL_FLOAT, 0, self.vertices) # Specify the vertex list to
> be used to draw the object
> glNormalPointer(GL_FLOAT, 0, self.normals) # Specify the normals list to be
> used to draw the object
>
> glDrawArrays(GL_QUADS,0,len(self.vertices))
>
>
> glDisableClientState(GL_VERTEX_ARRAY)
> glDisableClientState(GL_NORMAL_ARRAY)
>
> Ian
>
>
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-- 
Alejandro Segovia Azapian
Director, Algorithmia: Visualization & Acceleration
http://web.algorithmia.net