Timeline for Existence of vanishing point
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 4, 2021 at 20:21 | comment | added | Nicol Bolas | @User4567: Appearance and reality are not the same thing. A mirror does not create a reversed world; it merely reflects light. A lens in front of your retina that bends the path of light does not cause parallel lines to intersect, even if it makes it appear as if they do. Objects don't grow in size if they get closer to you, even if the lens over your retinas makes it appear that they do. | |
| Nov 4, 2021 at 19:55 | comment | added | user17337 | @Nicol but one question torturing me. If vanishing point we are seeing is not real. So how can we see it intersects at vanishing point?? | |
| Nov 4, 2021 at 19:40 | comment | added | Nicol Bolas | @User4567: It means "perspective". Like, from the dictionary. | |
| Nov 4, 2021 at 19:33 | comment | added | user17337 | @Nicol "human vision only sees a perspective on reality."--- could you what does mean by *perspective" here? | |
| Nov 1, 2021 at 13:59 | comment | added | user17337 | @Nicol I understand at the end (xp, yp) after ndc. But in projection plane it is (xp, yp, zp). Am I correct? | |
| Nov 1, 2021 at 13:19 | comment | added | Nicol Bolas | @User4567: "in perspective projection the point (X, y, z) transform to (xp, yp, zp)" No, it goes to (xp, yp). There is no Z at the end of the perspective projection process. "why we said it's perspective projection" For the same reason we usually say "oak tree" instead of "oak plant", even though both are valid. | |
| Nov 1, 2021 at 11:19 | vote | accept | CommunityBot | ||
| Nov 1, 2021 at 9:48 | comment | added | user17337 | @nicol in perspective projection the point (X, y, z) transform to (xp, yp, zp) , so it should be perspective transformation but why we said it's perspective projection? | |
| Nov 1, 2021 at 9:35 | comment | added | lightxbulb | @User4567 It is because people (me included) have trouble understanding what you mean as you have worded it. How do you get $(x_p, y_p, z_p)$ mathematically from $(x,y,z)$? | |
| Nov 1, 2021 at 7:13 | comment | added | user17337 | @joojaa It's much controversial question I have ever seen. Some people saying vanishing point exists some saying it doesn't. Some saying it's projection like normal point. Some saying it represents by projective plane point (X, y, 0) .... Don't know what is right? | |
| Nov 1, 2021 at 6:54 | comment | added | joojaa | I think there may be a confusion as to what a computer graphics pipeline does versus what projection means | |
| Nov 1, 2021 at 6:54 | comment | added | user17337 | question is could I represents vanishing point (x,y,z) transforms to (xp,yp,zp)? | |
| Nov 1, 2021 at 6:19 | comment | added | Nicol Bolas | I don't know what you mean by "normal point projection". Do you mean a perspective projection? And as has been discussed several times now, it's not a projection if it transforms between spaces that have the same dimensions. | |
| Nov 1, 2021 at 5:51 | comment | added | user17337 | Is it projecting like normal point projection (x,y,z) to in view plane (xp,yp,zp)? | |
| Nov 1, 2021 at 3:14 | history | answered | Nicol Bolas | CC BY-SA 4.0 |