reverse camera project
Blitz3D Forums/Blitz3D Programming/reverse camera project
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has anyone created any code that can return the nearest x y z coordinate of a 2d x y viewport coordinate? |
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Correct me if I'm wrong, but I believe what you're looking for is the CameraPick function which you can find out more about in the Blitz manual. |
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no because that requires you to pick an entity in order to get the x y z coordinates. but thanks anyways. i found a nifty one in the code archives for orthogonic view which is what i was looking for. |
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orthogonal will just be wrong if you don't use that camera |
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no because that requires you to pick an entity in order to get the x y z coordinates But if you don't pick to an entity, how can you possibly determine the Z component of the position? If you don't want to make all your entities pickable, how about pick against using your skybox or ground plane instead? You could even place a vertical sprite in front of the camera, set the order to render behind anything else, then pick against that. Should be quick enough as you can use a really short pick range. |
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Why not build up a list of onscreen entities. Grab all there 2d co-ords onscreen and compare against the mousex and y co-ords? Or... colour the backround black. Have each entity have it's own colour. Grab the colour of the pixel on the screen at the mouse X and Y co-ords. And look it up against the entity colours? You'll need to keep track of your entities via types or array, which is always handy to do anyway :o) |
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Uh, only way i can think of to easily do it in Blitz3D: have an invisible yete pickable quad in front of the camera and camerapick it. Z will always be whatever you want it to be, just set the plane at Z in front of the camera and align it to the camera. |
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I think he's wanting to click somewhere on the screen, at the mouse's co-ords and get the nearest entity's xyz co-ords. |
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the one i got works perfectly. i have 3 views which use ortho, top left and front. i only need two axises for each view. the one i got in the code archives works beautifully. |
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basically i needed it so i can draw 3d geometry like ms paint LOL, best part is it works like paint with 3 views |