Works fine with Processing 4.1.1:
Be careful with names… I used txt and you had txtr in your examples.
It may be as simple as that… scrutinize your code.
moebius.obj data to copy to moebius.obj file :
Click to Open!
# Blender 3.3.2
# www.blender.org
o moebius
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f 50/131/55 18/46/55 20/50/55
f 20/51/56 51/132/56 50/129/56
f 51/132/57 20/51/57 22/56/57
f 22/55/58 52/137/58 51/134/58
f 52/135/59 22/56/59 24/59/59
f 24/60/60 53/140/60 52/137/60
f 53/138/61 24/61/61 26/66/61
f 26/65/62 54/142/62 53/140/62
f 54/141/63 26/66/63 28/72/63
f 28/71/64 55/145/64 54/142/64
f 55/144/65 28/72/65 30/78/65
f 30/77/66 56/148/66 55/145/66
f 56/147/67 30/78/67 32/83/67
f 32/82/68 57/152/68 56/149/68
f 57/150/69 32/83/69 34/88/69
f 34/87/70 58/154/70 57/152/70
f 58/153/71 34/88/71 36/92/71
f 36/92/72 59/156/72 58/153/72
f 59/156/73 36/92/73 38/98/73
f 38/98/74 60/158/74 59/156/74
f 60/158/75 38/98/75 40/104/75
f 40/104/76 61/161/76 60/158/76
f 61/161/77 40/104/77 42/107/77
f 42/107/78 62/166/78 61/161/78
f 63/168/79 43/111/79 44/114/79
f 44/114/80 64/169/80 63/168/80
f 64/169/81 44/114/81 45/117/81
f 45/117/82 65/172/82 64/169/82
f 65/172/83 45/117/83 46/119/83
f 46/119/84 66/175/84 65/172/84
f 66/175/85 46/119/85 47/121/85
f 47/121/86 67/178/86 66/175/86
f 67/177/87 47/122/87 48/125/87
f 48/124/88 68/181/88 67/178/88
f 68/180/89 48/125/89 49/126/89
f 49/127/90 69/183/90 68/181/90
f 69/184/91 49/128/91 50/131/91
f 50/130/92 70/186/92 69/183/92
f 70/187/93 50/131/93 51/134/93
f 51/133/94 71/190/94 70/186/94
f 71/189/95 51/134/95 52/137/95
f 52/136/96 72/192/96 71/190/96
f 72/193/97 52/137/97 53/140/97
f 53/139/98 73/196/98 72/194/98
f 73/195/99 53/140/99 54/142/99
f 54/143/100 74/198/100 73/196/100
f 74/198/101 54/143/101 55/146/101
f 55/145/102 75/202/102 74/199/102
f 75/201/103 55/146/103 56/149/103
f 56/148/104 76/205/104 75/202/104
f 76/204/105 56/149/105 57/152/105
f 57/151/106 77/208/106 76/205/106
f 77/207/107 57/152/107 58/154/107
f 58/155/108 78/210/108 77/208/108
f 78/210/109 58/155/109 59/157/109
f 59/157/110 79/212/110 78/210/110
f 79/212/111 59/157/111 60/160/111
f 60/159/112 80/216/112 79/213/112
f 80/215/113 60/160/113 61/163/113
f 61/162/114 81/219/114 80/216/114
f 81/218/115 61/163/115 62/164/115
f 62/165/116 82/222/116 81/219/116
f 2/4/117 83/223/117 63/167/117
f 63/167/118 3/6/118 2/4/118
f 3/6/119 63/167/119 64/170/119
f 64/170/120 5/11/120 3/6/120
f 5/10/121 64/171/121 65/174/121
f 65/173/122 7/16/122 5/11/122
f 7/17/123 65/174/123 66/176/123
f 66/176/124 9/22/124 7/17/124
f 9/22/125 66/176/125 67/179/125
f 67/179/126 11/27/126 9/22/126
f 11/27/127 67/179/127 68/182/127
f 68/182/128 13/31/128 11/27/128
f 13/31/129 68/182/129 69/184/129
f 69/184/130 15/37/130 13/31/130
f 15/36/131 69/185/131 70/188/131
f 70/187/132 17/41/132 15/37/132
f 17/42/133 70/188/133 71/191/133
f 71/190/134 19/47/134 17/43/134
f 19/48/135 71/191/135 72/194/135
f 72/194/136 21/52/136 19/48/136
f 21/52/137 72/194/137 73/196/137
f 73/197/138 23/58/138 21/53/138
f 23/58/139 73/197/139 74/200/139
f 74/200/140 25/63/140 23/58/140
f 25/63/141 74/200/141 75/203/141
f 75/203/142 27/69/142 25/63/142
f 27/69/143 75/203/143 76/206/143
f 76/206/144 29/75/144 27/69/144
f 29/75/145 76/206/145 77/209/145
f 77/209/146 31/80/146 29/75/146
f 31/80/147 77/209/147 78/211/147
f 78/211/148 33/85/148 31/80/148
f 33/85/149 78/211/149 79/214/149
f 79/214/150 35/90/150 33/85/150
f 35/90/151 79/214/151 80/217/151
f 80/217/152 37/95/152 35/90/152
f 37/95/153 80/217/153 81/220/153
f 81/220/154 39/101/154 37/95/154
f 39/101/155 81/220/155 82/221/155
f 82/221/156 41/105/156 39/101/156
f 41/105/157 82/221/157 84/226/157
f 84/226/158 83/224/158 41/105/158
f 82/222/159 62/165/159 1/2/159
f 1/2/160 84/225/160 82/222/160
f 2/3/161 1/1/161 62/166/161
f 62/166/162 42/107/162 2/3/162
f 83/223/163 2/4/163 42/108/163
f 42/108/164 41/106/164 83/223/164
f 84/225/165 1/2/165 4/8/165
f 4/8/166 43/110/166 84/225/166
f 83/224/167 84/226/167 43/111/167
f 43/111/168 63/168/168 83/224/168
Working code:
PShape mobius;
PImage txtr;
void setup()
{
size(500, 500, P3D);
txtr = loadImage("http://learningprocessing.com/code/assets/sunflower.jpg");
mobius = loadShape("moebius.obj");
mobius.setFill(color(255)); // Brigthens the texture
mobius.setTexture(txtr);
}
void draw()
{
background(255);
translate(width/2, height/2);
lights();
rotateY(mouseX*TAU/width);
rotateX(mouseY*TAU/height);
scale(6);
shape(mobius);
}
And voila!
:)