Some visual Issues with my graphics
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Hi everyone,
I'm working on a large Airport model, and I keep having an Issue where part of the model appears to be cut off when I zoom in.
I'm running SketchUp 6 Pro.
Does anyone know what this is and how I might fix it? -
Hi,
It happens to me sometimes...I think it's because the sketchup's camera is too close to your model. Try to change ortho/perspective view of camera, maybe that'll help.
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Clipping, it's a known issue with SketchUp.
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Clipping is a known issue of perhaps every 3d application? Its why 3d games don't let you zoom in very close to anything. They put clipping restraints placed on cameras to keep them from getting to close and clipping objects. If there are programs that truly get around clipping, it would be cool to know how they do it though if anyone has any more specific info?
Chris
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@chris fullmer said:
Clipping is a known issue of perhaps every 3d application? Its why 3d games don't let you zoom in very close to anything. They put clipping restraints placed on cameras to keep them from getting to close and clipping objects. If there are programs that truly get around clipping, it would be cool to know how they do it though if anyone has any more specific info?
Chris
You're right, its a problem for all zbuffer based 3d applications. Which basically means all 3d applications.
A zbuffer stores 1/z for every pixel, so by controlling the near clip plane you can get significantly better z-precision.
Its all about the ratio between the furthest thing drawn and the closest thing drawn. So if you want better precision you might want to hide stuff further away.In answer to your question about getting around it. Its a problem thats largely ignored by cunningly choosing near and far clip planes that do an OK job most of the time. If you really want to get around it you do whats known as "slab rendering". You render your scene in slabs of Z using the whole resolution of the Z buffer for each pass building up from far to near thus effectively doubling/tripling etc your actual Zbuffer resolution. Its actually not as hideous as it sounds performance-wise because of course each slab culls out most of the scene..
There, you asked.
Adam
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Something like that is precisely what I was hoping to hear, thanks Adam! I know clipping is a recurring issue in many/most 3d aplications (3d game engines, 3d modelers, etc). So I don't think its fair to call it a SketchUp bug when in reality it is more of a general 3d issue.
So again, thanks for the info. I want to look more in to this for sure! Its as fun as z-fighting, occlusion culling, and the carmack reverse!
Chris
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Switch to parallel mode, that should sort this out. If your model still looks clipped, hit Zoom Extent, then zoom back in.
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