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Activity Forums Apple Motion When camera crosses X axis, objects dim

  • When camera crosses X axis, objects dim

    Posted by Alan Langdon on December 17, 2021 at 8:36 pm

    Motion 5.6

    Big Sur 10.6.1

    I have a 3D scene made up of a camera, a few lights, and some 2D planes making up a virtual room (gallery) with some 16×9 videos on the walls (as if they were TVs).

    <font face=”inherit”>This </font>issue has happened three times, even when I start again and create a new camera.

    My camera has keyframes which take it up to one piece on the wall and then it rotates and looks at another piece (2 TVs, in this case). The weird thing is that when the camera crosses the X axis (precise the “0”, zero), the two TVs it is looking at dim quite a bit. So its like as we approach the TVs, they suddenly dim, say, 50%! The only thing I can see which is measurable is that the camera is crossing the x axis, which should mean nothing in 3D animation, of course, nothing unusual. What is going on?

    I am somewhat new to Motion, this is the third question this week, but really… this is weird! Can anybody shed some light, please? Attached are 2 videos showing how this happens when I move the camera back and forth the 0 (zero) of the X axis.

    Many thanks!

    Ben Balser replied 1 year, 6 months ago 3 Members · 4 Replies
  • 4 Replies
  • Alan Langdon

    December 17, 2021 at 9:08 pm

    OK, so proving into this issue, I have found that if I go to the Group containing the 2 TVs which dim when the camera crosses the X axis… if I go into the Properties of the Group and choose, under Lighting / Sahding, and lave it OFF, I do not get this use… I guess I solved it, although it really baffles me that such a sudden change in brightness can happen just because the camera moved one degree this or that way. Any info on this will be much appreciated!

  • Mark Spencer

    December 22, 2021 at 3:10 pm

    Are you using directional lights?

  • Alan Langdon

    December 22, 2021 at 7:01 pm

    Well, yes, there is one directional light pointed at the wall where the TVs are, plus a few spot lights.

  • Ben Balser

    December 15, 2022 at 3:59 pm

    Some object is causing this, either a wall, or your camera moves out of the lights, look very carefully at everything in your scene, what is, or isn’t, in front of that camera at that moment, that should/shouldn’t be there?

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