Wireframe mode

[MrTAToad]

Would be nice if there was a wireframe mode for objects.

[Schranz0r]

Take a look at : X_GETFACE

[MrTAToad]

Thats true - the only problem is that X_LINE could do with being sped up a bit.  The larger object would be slower to display than a native command.

[Quentin]

It is quite easy to use wireframe mode, if you use the OpenGL-Wrapper from Gernot

in the following example you'll have to add the files
3DPrimitives.gbas
gl.gbas
to your project and you can see the torus in wireframe mode

Code: (glbasic) [Select]

CreateTorus(0, 2, 5, 20, 4, 0, 0, RGB(255, 255,255))

glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)

WHILE TRUE
X_MAKE3D .1, 1000, 45
X_CAMERA 2, 2, -20, 0, 0, 0
X_AMBIENT_LT 0, RGB(255, 255, 255)
X_ROTATION phi, 1, 1, 0
X_DRAWOBJ 0, 0
INC phi, .2
SHOWSCREEN
WEND

you can switch back to filled mode easily with

glPolygonMode(GL_FRONT_AND_BACK, GL_FILL)

[MrTAToad]

Ah, thats handy!

[Quentin]

by the way: as it seems that glPolygonMode is what X_CULLMODE is in GLBasic  ...

what about a second optional paramter for X_CULLMODE? e.g.  X_CULLMODE mode%, wire% = FALSE

[bigsofty]

Word to the wise, be aware that glPolygonMode is not available in OpenGLES, so anything off of a desktop probably does not support this code...

[Quentin]

hi Ocean,
sure, it's also possible to use these functions within the loop.

Code: (glbasic) [Select]

CreateTorus(0, 2, 5, 20, 4, 0, 0, RGB(255, 255,255))
CreateSphere(1, 2, 10, RGB(255, 255, 255))

WHILE TRUE
X_MAKE3D .1, 1000, 45
X_CAMERA 2, 2, -20, 0, 0, 0
X_AMBIENT_LT 0, RGB(255, 255, 255)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)
X_ROTATION phi, 1, 1, 0
X_DRAWOBJ 0, 0
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL)
X_MOVEMENT 0, 0, 2
X_ROTATION phi, 1, 0, 1
X_DRAWOBJ 1, 0
INC phi, .2
SHOWSCREEN
WEND

see also documentation here
http://www.opengl.org/documentation/specs/man_pages/hardcopy/GL/html/gl/polygonmode.html