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[Bug]: plot3d depth test is off #24767

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@ubitux

Description

@ubitux

Bug summary

The depth testing of points depends only on their coordinates and doesn't take into account the camera angle.

mpl-3d-depth.mp4

Code for reproduction

importmatplotlib.pyplotaspltcolors= [0x010101,0x050405,0x080809,0x0d0b0c,0x0d101e,0x110e0f,0x11192f,0x151213,0x161419,0x171514,0x18181a,0x182133,0x1d191b,0x1e2741,0x1f1c1d,0x214e92,0x221e11,0x222121,0x23539c,0x264b76,0x285ba6,0x2860ae,0x2866b3,0x29272c,0x293551,0x2a2322,0x2a6bbb,0x2b71c0,0x2b75c3,0x2c2d2f,0x2c3544,0x2d2b23,0x2d63b0,0x2e68b4,0x2f79c8,0x306ab8,0x306cbd,0x3070bf,0x307ecc,0x3175c2,0x3183d0,0x323031,0x362e2e,0x363536,0x366fbb,0x3683d0,0x3773c0,0x3777c3,0x3779c8,0x3880ca,0x3889d4,0x3b2920,0x3b3630,0x3b3a3c,0x3b3c43,0x3b90d8,0x3c2018,0x3c2f1f,0x3c3938,0x3e7dc3,0x3e7fc8,0x3e8cd4,0x3f84cc,0x3f86d1,0x403536,0x412e2d,0x4190d7,0x4194d9,0x42371f,0x423828,0x438fd2,0x4398db,0x444242,0x463e41,0x464648,0x473c3c,0x485064,0x488ad2,0x4898dc,0x4989cb,0x4a3930,0x4a4b50,0x4a93d7,0x4b3c37,0x4b8ac6,0x4b9ede,0x4c4f59,0x4e452c,0x4e91cf,0x4f453c,0x504537,0x505055,0x534842,0x534c49,0x535b69,0x5398d8,0x53a2e0,0x545050,0x559ddd,0x566674,0x5681ab,0x57a7e1,0x585959,0x58a0d8,0x58a3dd,0x5995ca,0x5999d1,0x5aa6dd,0x5bace1,0x5daee4,0x633f32,0x63524f,0x644543,0x645954,0x64605e,0x646263,0x64656b,0x64b1e5,0x655241,0x657487,0x659cc9,0x65a4d2,0x65aadb,0x65ace2,0x6790b3,0x686a6e,0x695f53,0x6a6e73,0x6a96bd,0x6ab5e6,0x6b7479,0x6b7e8a,0x6db1e3,0x6db5e2,0x6e86a1,0x6ea4cb,0x70acd8,0x73aad2,0x747477,0x747f89,0x74b0da,0x75b8e6,0x76574a,0x774f3a,0x775b55,0x776a66,0x787b7c,0x78b8e1,0x7a6955,0x7a736c,0x7e8790,0x7ea6c6,0x7f97ad,0x7fb5da,0x808285,0x80bbe2,0x817e7c,0x81afd0,0x84bfe2,0x87888a,0x88725f,0x88b7d8,0x897353,0x8a7a6c,0x8abedc,0x8b959e,0x8d8379,0x8e5134,0x8e8b8b,0x8e9396,0x90adc6,0x90b3ce,0x91a0aa,0x91bdd9,0x92604f,0x92795f,0x929291,0x92b9d1,0x94806c,0x95bdd7,0x96938b,0x989a9d,0x999897,0x9a8779,0x9b9283,0x9cbfd8,0x9d9174,0x9da4aa,0x9e9f9f,0xa1846b,0xa4a5a7,0xa57c60,0xa5abae,0xa6b9c6,0xa6bdc9,0xa7a29d,0xa99e8f,0xa9b6c0,0xaa946f,0xaaaaaa,0xac946b,0xac9773,0xacafb1,0xacb2ba,0xad9a77,0xad9c84,0xaf5f25,0xafaa9e,0xb09e7d,0xb0b1b1,0xb3b8bb,0xb4bec3,0xb5b4b2,0xb77750,0xb7a68d,0xb8b8b4,0xb9a985,0xbaa246,0xbbbbbc,0xbbc4c9,0xbcaf8f,0xbcb4ab,0xbcc1c1,0xbd732d,0xbeceda,0xc1b29c,0xc1c3c3,0xc2b9ac,0xc4beb0,0xc5c5c4,0xc6cac8,0xc6ccce,0xc7b590,0xc8bc9d,0xcbc5bf,0xcec3ad,0xceccc6,0xcfd0cf,0xd1c09d,0xd3cec4,0xd3d2d1,0xd5d5d6,0xd6c7ac,0xd6d0c7,0xd8d7cf,0xd9dbda,0xdbcfb1,0xdcd1c2,0xe1d8c8,0xe2e0db,0xe5e5e4,0xe8dfcb,0xeeece9,0xf4f5f6,0xfdfcfb,]ax=plt.figure().add_subplot(projection="3d")forcincolors:r,g,b=c>>16&0xff,c>>8&0xff,c&0xffax.plot(r/0xff,g/0xff,b/0xff,"o",color=f"#{c:06x}")plt.show()

Actual outcome

Whether we look from an angle or the opposite one, we always have the higher coordinates visible in front (the clear ones, that is the closest to(1,1,1)).

Expected outcome

The darker points ((0,0,0)) should be in front when looking from the "bottom" angle, and the lighter points from the other angle (like currently).

Additional information

No response

Operating system

Arch

Matplotlib Version

3.6.2

Matplotlib Backend

GTK3Agg

Python version

3.10.8

Jupyter version

No response

Installation

Linux package manager

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