def getProjection(self, jittered=False, point=None):
if self.is_perspective:
viewportRadius = self.near_plane * math.tan(
self.fov_degrees / 2.0 / 180.0 * math.pi)
else:
viewportRadius = self.ortogrphic_width * 0.5
if self.viewportWidthInPixels < self.viewportHeightInPixels:
viewportWidth = 2.0 * viewportRadius
viewportHeight = viewportWidth * self.viewportHeightInPixels / float(
self.viewportWidthInPixels)
else:
viewportHeight = 2.0 * viewportRadius
viewportWidth = viewportHeight * self.viewportWidthInPixels / float(
self.viewportHeightInPixels)
left = 0.5 * viewportWidth
right = -0.5 * viewportWidth
bottom = -0.5 * viewportHeight
top = 0.5 * viewportHeight
if jittered:
if not point:
x_j = random.uniform(
-.75, .75) * viewportWidth / self.viewportWidthInPixels
y_j = random.uniform(
-.75, .75) * viewportHeight / self.viewportHeightInPixels
else:
x_j = (point[0] -
0.5) * 1.0 * viewportWidth / self.viewportWidthInPixels
y_j = (point[1] - 0.5
) * 1.0 * viewportHeight / self.viewportHeightInPixels
left += x_j
right += x_j
top += y_j
bottom += y_j
if self.is_perspective:
return Matrix44.perspective_projection_bounds(
left, right, top, bottom, self.near_plane, self.far_plane)
else:
return Matrix44.orthogonal_projection(left, right, top, bottom,
self.near_plane,
self.far_plane)
