def set_view_up_direction(self, viewer_up):
if abs(viewer_up.y) < 0.999:
cp = cross_product(viewer_up, Vector3(0, 0, 0))
cp = normalized(cp)
self.geo_to_viewer_transform = create_rotation(math.acos(viewer_up.y), cp)
else:
self.geo_to_viewer_transform = create_identity()
self.must_update_transformed_orientation = True
def begin_drawing(self, gl):
'''
Sets OpenGL state for rapid drawing
'''
self.texture_ref.bind(gl)
gl.glShadeModel(gl.GL_FLAT)
########################################################################## added Blending
gl.glEnable(gl.GL_BLEND)
gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)
gl.glEnable(gl.GL_ALPHA_TEST)
gl.glAlphaFunc(gl.GL_GREATER, 0.5)
gl.glEnable(gl.GL_TEXTURE_2D)
# We're going to do the transformation on the CPU, so set the matrices
# to the identity
gl.glMatrixMode(gl.GL_PROJECTION)
gl.glPushMatrix()
gl.glLoadIdentity()
gl.glMatrixMode(gl.GL_MODELVIEW)
gl.glPushMatrix()
gl.glLoadIdentity()
gl.glOrtho(0, self.render_state.screen_width,
0, self.render_state.screen_height,
-1, 1)
# equivalent of a call to GLBuffer.unbind(gl)
gl.glBindBuffer(gl.GL_ARRAY_BUFFER, 0)
gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, 0)
gl.glEnableClientState(gl.GL_VERTEX_ARRAY)
gl.glEnableClientState(gl.GL_TEXTURE_COORD_ARRAY)
gl.glDisableClientState(gl.GL_COLOR_ARRAY)
rs = self.render_state
view_width = rs.screen_width
view_height = rs.screen_height
rotation = create_rotation(rs.up_angle, rs.look_dir)
self.label_offset = multiply_MV(rotation, rs.up_dir)
# If a label isn't within the field of view angle from the target vector, it can't
# be on the screen. Compute the cosine of this angle so we can quickly identify these.
DEGREES_TO_RADIANS = math.pi / 180.0
self.dot_product_threshold = math.cos(rs.radius_of_view * DEGREES_TO_RADIANS * \
(1 + view_width / float(view_height)) * 0.5)
def begin_drawing(self, gl):
'''
Sets OpenGL state for rapid drawing
'''
self.texture_ref.bind(gl)
gl.glShadeModel(gl.GL_FLAT)
########################################################################## added Blending
gl.glEnable(gl.GL_BLEND)
gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)
gl.glEnable(gl.GL_ALPHA_TEST)
gl.glAlphaFunc(gl.GL_GREATER, 0.5)
gl.glEnable(gl.GL_TEXTURE_2D)
# We're going to do the transformation on the CPU, so set the matrices
# to the identity
gl.glMatrixMode(gl.GL_PROJECTION)
gl.glPushMatrix()
gl.glLoadIdentity()
gl.glMatrixMode(gl.GL_MODELVIEW)
gl.glPushMatrix()
gl.glLoadIdentity()
gl.glOrtho(0, self.render_state.screen_width, 0,
self.render_state.screen_height, -1, 1)
# equivalent of a call to GLBuffer.unbind(gl)
gl.glBindBuffer(gl.GL_ARRAY_BUFFER, 0)
gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, 0)
gl.glEnableClientState(gl.GL_VERTEX_ARRAY)
gl.glEnableClientState(gl.GL_TEXTURE_COORD_ARRAY)
gl.glDisableClientState(gl.GL_COLOR_ARRAY)
rs = self.render_state
view_width = rs.screen_width
view_height = rs.screen_height
rotation = create_rotation(rs.up_angle, rs.look_dir)
self.label_offset = multiply_MV(rotation, rs.up_dir)
# If a label isn't within the field of view angle from the target vector, it can't
# be on the screen. Compute the cosine of this angle so we can quickly identify these.
DEGREES_TO_RADIANS = math.pi / 180.0
self.dot_product_threshold = math.cos(rs.radius_of_view * DEGREES_TO_RADIANS * \
(1 + view_width / float(view_height)) * 0.5)