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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(275.2, 28.000000000000004%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EW%3C/text%3E%3C/svg%3E)
Trying to understand how the PerspectiveCamera handles 3D to 2D projection and Near/FarPlaneDistance. In this example a Model3DGroup has a single GeometryModel3D which is a sphere mesh with diameter 1,392,700 centered at (0,0,0). Camera's FarPlaneDistance = 2.5E09, and NearPlaneDistance = 1.5E6.
With Camera looking at (0,0,0) at distance 22,805,665 the scene looks like
At distance 23,801,973 the scene looks like
And at distance 24,798,579 the sphere is no longer visible, it disappears
What is causing the sphere to disappear? It does not seem too far away to project; it is within the NearPlaneDistance and FarPlaneDistance planes.
Any thoughts as to why the item disappears from the scene?
Thanks!
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(291.2, 11%, 38%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EHL%3C/text%3E%3C/svg%3E)
Hi,@WoodManEXP . Welcome Microsoft Q&A. Could you show me your minimal example that reproduces the problem?
The project is in GitHub. It could be gotten from there and be built. I could show the few things that need to be commented-out/changed to get it closer to that minimal example. Would that work?
TY
Hi,@WoodManEXP . Is it possible to show a link to the GitHub where the project is located?
The github link is https://github.com/WoodManEXP/OrbitalSimWPF
Pls send your github name so you can be marked as Collaborator in order to access the repo. TY!
Hi,@WoodManEXP . It is recommended that you provide links to public code without private information.
Hi @Hui Liu-MSFT , Try to see the project at https://github.com/WoodManEXP/OrbitalSimWPF. TY!
Hi @Hui Liu-MSFT , Have you been able to reference the project in Github?
The answer to this is has to do with rounding as WPF projects from the 3D World to the 2D screen coordinates. It was using really large 3D World coordinate values After they were scaled down by a few orders of magnitude the projections behave better.