Need some help with the perspective
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    Need some help with the perspective

    Hey!

    I don't really have any major difficulties with perspective but there's something (simple?) that I can't really figure out. Everyone knows how to draw a box in perspective but what if you want do draw a correct cube? (for an instance, 5 x 5 x 5)

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    There are ways to do it with mathematical certainty, but the exact angles and dimensions will vary with the position of and distance of the cube relative to the observer. If you're eyeballing it and just want to make it look "not wrong," the important thing is to not do what you've done in your example, which is make the receding edges longer than the height. They have to be shorter (think about it).


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    Here is how you can do it. You need to create a plan view of the object in this case a cube. Height ,width and depth. Choose you eye level and vanishing points for the image and the angle you want the cube at. Using the views of the object, you can now create your cube in perspective.

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    JeffX99 is offline Registered User Level 17 Gladiator: Spartacus' Dimachaeri
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    Nice - you beat me to it! How do you design an aquarium?

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    Another way of doing it is by using measuring points equally spaced from either side of the vertical scale on the horizon, and drawing lines back to the opposing sides of the horizontal scale will give you the receding corners of the cube.



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    Thanks to Dpaint and Balooga for introducing me to the insanity of rocket science.

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    Looks like others beat me to it!

    Being that I did mine earlier, I'll throw it on the pile anyway!

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    Hmmm...I'm not familiar with the "cut point" concept Kamber - where you've drawn a line from SP to the corners then dropped those down to the HL? I've always just dropped those down perpendicular. The reason I mention it is it seems to have actually thrown it off - the cube looks taller than it should be rather than a true cube. IDK - just an observation - perspective is pretty fascinating, eh?

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    Quote Originally Posted by JeffX99 View Post
    Hmmm...I'm not familiar with the "cut point" concept Kamber - where you've drawn a line from SP to the corners then dropped those down to the HL? I've always just dropped those down perpendicular. The reason I mention it is it seems to have actually thrown it off - the cube looks taller than it should be rather than a true cube. IDK - just an observation - perspective is pretty fascinating, eh?
    It's the same thing illustrated in dpaints diagram-- I'm just saying that the perpendiculars are dropped from where the lines from the corners (to the SP) "cut" the picture plane.

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    Ooops - my bad - I see that in his diagram - should have paid more attention. Yours still seems taller? I wonder if because it doesn't have the elevation reference?

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    I didn't have my triangles with me when I laid out the perspective. And, I guestimated the 45 degree angles of the plan view by tracing the edges of my pencil sharpener. Further, without a triangle, I eyeballed all the perpendiculars with my ruler.

    So, you might be picking up on some tweaky alignment or skewing error!

    The theory should work though!

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    Elwell: Indeed, I just used it as an example. Thanks for your time though!

    dpaint, Balooga and Kamber Parrk: I do understand some parts of what you're saying - though, not entirely.
    But I'll take a closer look later tonight and hopefully, it will be more understandable then Thanks a lot for your help!!

    Xeon OND: Haha, yeah

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    I think with everyone's diagrams you should be able to solve your cube!

    I did seem quite able to confuse JeffX99 with my cluttered diagram and child-like handwriting! If my stuff is still confusing, post back, I'll try to 'splain it!

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    Maybe it's not my place to say this, but considering there was a similar thread here:http://www.conceptart.org/forums/sho...d.php?t=173013

    Just a few topics down, in the interest of saving space and organizing information, it'd really better to ask there rather than make a new thread. Is it possible these could be combined?

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