def draw_line_XZ(L=np.array([0,1,1],'f')):
glClearColor(0,0,0,1)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glEnable(GL_DEPTH_TEST)
eye = projector.RT[:3,3]
with projector.viewpoint_projection(eye, 0):
a,b,c = L
# Solve for the point on the line nearest to the origin
p = (a*c, b*c, -(a*a + b*b))
within_eps = lambda a, b: np.abs(a-b) < 1e-5
assert within_eps(np.dot(L, p), 0)
perp = np.array([a, b],'f')
v = np.array([b, -a],'f')
p = np.array(p[:2])/p[2]
glColor(1,1,1,1)
glBegin(GL_QUADS)
for p_ in (p - 10*v,
p - 10*v + 10*perp,
p + 10*v + 10*perp,
p + 10*v):
glVertex(p_[0], 0, p_[1])
glEnd()
window.canvas.SwapBuffers()
def on_draw():
glClearColor(0,0,0,1)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glEnable(GL_DEPTH_TEST)
global projector
if not 'projector' in globals(): return
# Project decals directly to the projector, no eye needed
with opengl_state():
projector.setup_projection_matrix()
# draw_decals() # Depth is inconsistent between decals and viewpoint
# For each projection surface plane, we need to do a render
for plane_index in [0, 1]:
with projector.viewpoint_projection(eye, plane_index):
draw_decals()
draw_objects(eye)
