add example of how to map screen to world #512
Conversation
|
Nice example to have! Note that this will change / get easier with #492. |
|
I think this should be good to go, or I can wait until #492 and update it then. |
|
Would you mind waiting at least for #482? |
|
Yes of course (I haven't been following that PR, it is massive 😄 ) |
It's been merged now, so if you can refactor your example to be compatible, we can have another look and merge it. |
|
Digging through pos_world = (
camera.position.clone().project(camera).add(pos_ndc).unproject(camera)
)This is not quite right: # this is the click position in canvas space
pos = (ev.x, ev.y)
print(f"position click: {pos}")
for viewport, scene, camera in zip(viewports, scenes, cameras):
if not viewport.is_inside(*pos):
continue
# get position relative to viewport
pos_rel = (
pos[0] - viewport.rect[0],
pos[1] - viewport.rect[1],
)
vs = viewport.logical_size
# convert position to NDC
x = pos_rel[0] / vs[0] * 2 - 1
y = -(pos_rel[1] / vs[1] * 2 - 1)
pos_ndc = (x, y)
vec = vec_unproject(
pos_ndc, camera.camera_matrix
)
x = vec[0] + x
y = vec[1] + y
pos_world = vec_transform((x, y, 0), camera.view_matrix)clicks-2023-05-22_02.21.07.mp4 |
|
You'd have to use the abs_pos_ndc = vec_transform(camera.world.position, camera.camera_matrix) + pos_ndc
pos_world = vec_unproject(abs_pos_ndc, camera.camera_matrix) |
|
That almost does it, thanks! Ready for a look again. I think a click exampe for perspective projections can be separate since that's a bit more involved. |
|
Thanks again! |
Simple example of how to map event locations from screen space to world space, includes viewports. As someone who isn't really a graphics person it took me a while to figure out 😄
click_example-2023-04-19_02.57.02.mp4