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Open GL Not Drawing Lines in Certain Views


trashcan

Question

I have a work-around for this. I think it's a z-fighting issue. The work around I use I don't love because it changes the math for projector calculations and that isn't ideal. I'd love to see if there's another way to do this. For those with similar issues here's a work-around that I employ. 

 

Here's my projector study in an isometric view:

image.thumb.png.7eaef3324281013b4fee28887696679f.png

Here's what it looks like straight on:

image.thumb.png.a87443fee7a5686a01e12506ff8a9a45.png

 

Hey where'd my lines go at the top and bottom of the projection field!? Where's the blend?! It should look like this (with the target blue and grey still visible):

image.thumb.png.d6439d3c87b5defe58fca8ef743b6c7c.png

 

The only way I know to fix this is to nudge the projectors back by 1/64" or the wall forward by the same. This will eliminate Z-fighting, but my math will now be off by 1/64. No sweat off my back, you say? I'm trying to keep things precise! 

 

Here's the end result, with the nudge:

image.thumb.png.4839f18dc4c43c2ab61bc4aee8b67da2.png

 

Any cleaner solves out there? This is confusing to me because the lines draw properly in an iso view but not straight on. 

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