Orthographic

class glumpy.transforms.OrthographicProjection(*args, **kwargs)

Bases: glumpy.transforms.transform.Transform

Orthographic projection (or orthogonal projection) is a means of representing a three-dimensional object in two dimensions. It is a form of parallel projection, where all the projection lines are orthogonal to the projection plane, resulting in every plane of the scene appearing in affine transformation on the viewing surface.

Parameters:

• aspect (float) – Aspect ratio (width/height). Default is None.
• xinvert (bool) – Whether to invert X axis. Default is False.
• yinvert (bool) – Whether to invert Y axis. Default is False.
• znear (int) – Z near clipping place. Default is -1000.
• zfar (int) – Z far clipping place. Default is +1000.
• normalize (bool) – Whether to use normalized device coordinates. Default is False

The transform is connected to the following events:

• on_attach: Transform initialization
• on_resize: Recompute projection matrix

Usage example

vertex = '''
attribute vec2 position;
void main()
{
    gl_Position = <transform>;
} '''
fragment = '''
void main()
{
    gl_FragColor = vec4(1,0,0,1);
} '''

window = app.Window()

@window.event
def on_draw(dt):
    window.clear()
    quad.draw(gl.GL_TRIANGLE_STRIP)

@window.event
def on_resize(w, h):
    quad['position'] = [(w-100,h-100), (w-100,h), (w,h-100), (w,h)]

quad = gloo.Program(vertex, fragment, count=4)
quad["transform"] = OrthographicProjection(Position("position"))
window.attach(quad["transform"])
app.run()

aspect

Aspect ratio

normalize

Whether to use normalized coordinates

xinvert

Whether to invert x axis

yinvert

Whether to invert y axis

zfar

Z far clipping place

znear

Z near clipping place