回答編集履歴
1
背景不透明化案を追記
answer
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@@ -8,4 +8,284 @@
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背面から見れば三角形は背景に隠れて見えなくなりました。
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##追記
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背景を下図のようなメッシュにして...
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```Wavefront OBJ
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# 64 vertex positions
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v -37.5 50 0
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v -37.5 46.875 0
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v 37.5 46.875 0
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v 37.5 50 0
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v 41.149174 46.138271 0
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v 42.365566 49.017689 0
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v 44.129128 44.129128 0
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v 46.338837 46.338837 0
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v 46.138271 41.149174 0
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v 49.017689 42.365566 0
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v 46.875 37.5 0
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v 50 37.5 0
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v 46.875 -37.5 0
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v 50 -37.5 0
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v 46.138271 -41.149174 0
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v 49.017689 -42.365566 0
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v 44.129128 -44.129128 0
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v 46.338837 -46.338837 0
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v 41.149174 -46.138271 0
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v 42.365566 -49.017689 0
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v 37.5 -46.875 0
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v 37.5 -50 0
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v -37.5 -46.875 0
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v -37.5 -50 0
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v -41.149174 -46.138271 0
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v -42.365566 -49.017689 0
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v -44.129128 -44.129128 0
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v -46.338837 -46.338837 0
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v -46.138271 -41.149174 0
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v -49.017689 -42.365566 0
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v -46.875 -37.5 0
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v -50 -37.5 0
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v -46.875 37.5 0
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v -50 37.5 0
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v -46.138271 41.149174 0
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v -49.017689 42.365566 0
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v -44.129128 44.129128 0
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v -46.338837 46.338837 0
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v -41.149174 46.138271 0
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v -42.365566 49.017689 0
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v 37.5 43.75 0
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v -37.5 43.75 0
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v -37.5 37.5 0
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v 37.5 37.5 0
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v 43.75 -37.5 0
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v 43.75 37.5 0
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v 37.5 -37.5 0
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v -37.5 -43.75 0
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v 37.5 -43.75 0
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v -37.5 -37.5 0
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v -43.75 37.5 0
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v -43.75 -37.5 0
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v 43.258846 39.932781 0
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v 39.932781 43.258846 0
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v 41.919418 41.919418 0
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v 43.258846 -39.932781 0
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v 41.919418 -41.919418 0
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v 39.932781 -43.258846 0
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v -43.258846 -39.932781 0
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v -39.932781 -43.258846 0
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v -41.919418 -41.919418 0
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v -39.932781 43.258846 0
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v -43.258846 39.932781 0
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v -41.919418 41.919418 0
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# 64 UV coordinates
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vt 0.125 1 0
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vt 0.125 0.96875006 0
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vt 0.87500006 0.96875006 0
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vt 0.87500006 1 0
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vt 0.91149175 0.96138275 0
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vt 0.92365569 0.99017692 0
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vt 0.94129133 0.94129133 0
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vt 0.96338838 0.96338838 0
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vt 0.96138275 0.91149175 0
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vt 0.99017692 0.92365569 0
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vt 0.96875006 0.87500006 0
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vt 1 0.87500006 0
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vt 0.96875006 0.125 0
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vt 1 0.125 0
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vt 0.96138275 0.088508248 0
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vt 0.99017692 0.076344311 0
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vt 0.94129133 0.058708727 0
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vt 0.96338838 0.036611617 0
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vt 0.91149175 0.038617253 0
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vt 0.92365569 0.0098231435 0
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vt 0.87500006 0.03125 0
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vt 0.87500006 0 0
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vt 0.125 0.03125 0
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vt 0.125 0 0
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vt 0.088508278 0.038617253 0
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vt 0.076344334 0.0098231435 0
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vt 0.058708742 0.058708727 0
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vt 0.036611635 0.036611617 0
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vt 0.038617279 0.088508248 0
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vt 0.0098231202 0.076344311 0
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vt 0.03125 0.125 0
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vt 0 0.125 0
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vt 0.03125 0.87500006 0
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vt 0 0.87500006 0
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vt 0.038617279 0.91149175 0
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vt 0.0098231202 0.92365569 0
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vt 0.058708742 0.94129133 0
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vt 0.036611635 0.96338838 0
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vt 0.088508278 0.96138275 0
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vt 0.076344334 0.99017692 0
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vt 0.87500006 0.93750006 0
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vt 0.125 0.93750006 0
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vt 0.125 0.87500006 0
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vt 0.87500006 0.87500006 0
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vt 0.93750006 0.125 0
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vt 0.93750006 0.87500006 0
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vt 0.87500006 0.125 0
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vt 0.125 0.0625 0
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vt 0.87500006 0.0625 0
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vt 0.125 0.125 0
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vt 0.0625 0.87500006 0
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vt 0.0625 0.125 0
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vt 0.93258852 0.89932787 0
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vt 0.89932787 0.93258852 0
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vt 0.91919428 0.91919428 0
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vt 0.93258852 0.10067219 0
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vt 0.91919428 0.080805838 0
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vt 0.89932787 0.067411542 0
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vt 0.067411534 0.10067219 0
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vt 0.10067219 0.067411542 0
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vt 0.080805823 0.080805838 0
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vt 0.10067219 0.93258852 0
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vt 0.067411534 0.89932787 0
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vt 0.080805823 0.91919428 0
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# 1 vertex normals
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vn 0 0 1
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# Mesh 'SignBackground' with 66 faces
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g SignBackground
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f 1/1/1 2/2/1 3/3/1
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f 3/3/1 4/4/1 1/1/1
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f 4/4/1 3/3/1 5/5/1
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f 5/5/1 6/6/1 4/4/1
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f 6/6/1 5/5/1 7/7/1
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f 7/7/1 8/8/1 6/6/1
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f 8/8/1 7/7/1 9/9/1
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f 9/9/1 10/10/1 8/8/1
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f 10/10/1 9/9/1 11/11/1
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f 11/11/1 12/12/1 10/10/1
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f 12/12/1 11/11/1 13/13/1
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f 13/13/1 14/14/1 12/12/1
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f 14/14/1 13/13/1 15/15/1
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f 15/15/1 16/16/1 14/14/1
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f 16/16/1 15/15/1 17/17/1
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f 17/17/1 18/18/1 16/16/1
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f 18/18/1 17/17/1 19/19/1
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f 19/19/1 20/20/1 18/18/1
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f 20/20/1 19/19/1 21/21/1
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f 21/21/1 22/22/1 20/20/1
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f 22/22/1 21/21/1 23/23/1
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f 23/23/1 24/24/1 22/22/1
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f 24/24/1 23/23/1 25/25/1
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f 25/25/1 26/26/1 24/24/1
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f 26/26/1 25/25/1 27/27/1
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f 27/27/1 28/28/1 26/26/1
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f 28/28/1 27/27/1 29/29/1
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f 29/29/1 30/30/1 28/28/1
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f 30/30/1 29/29/1 31/31/1
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f 31/31/1 32/32/1 30/30/1
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f 32/32/1 31/31/1 33/33/1
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f 33/33/1 34/34/1 32/32/1
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f 34/34/1 33/33/1 35/35/1
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f 35/35/1 36/36/1 34/34/1
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f 36/36/1 35/35/1 37/37/1
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f 37/37/1 38/38/1 36/36/1
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f 38/38/1 37/37/1 39/39/1
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f 39/39/1 40/40/1 38/38/1
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f 40/40/1 39/39/1 2/2/1
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f 2/2/1 1/1/1 40/40/1
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f 41/41/1 42/42/1 43/43/1
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f 43/43/1 44/44/1 41/41/1
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f 45/45/1 46/46/1 44/44/1
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f 44/44/1 47/47/1 45/45/1
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f 48/48/1 49/49/1 47/47/1
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f 47/47/1 50/50/1 48/48/1
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f 51/51/1 52/52/1 50/50/1
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f 50/50/1 43/43/1 51/51/1
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f 41/41/1 44/44/1 46/46/1
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f 46/46/1 53/53/1 41/41/1
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f 54/54/1 41/41/1 53/53/1
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f 53/53/1 55/55/1 54/54/1
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f 56/56/1 45/45/1 47/47/1
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f 47/47/1 49/49/1 56/56/1
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f 57/57/1 56/56/1 49/49/1
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f 49/49/1 58/58/1 57/57/1
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f 48/48/1 50/50/1 52/52/1
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f 52/52/1 59/59/1 48/48/1
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f 60/60/1 48/48/1 59/59/1
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f 59/59/1 61/61/1 60/60/1
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f 51/51/1 43/43/1 42/42/1
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f 42/42/1 62/62/1 51/51/1
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f 63/63/1 51/51/1 62/62/1
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f 62/62/1 64/64/1 63/63/1
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f 50/50/1 47/47/1 44/44/1
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f 44/44/1 43/43/1 50/50/1
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```
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マテリアルは下記のように不透明両面描画とし...
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```ShaderLab
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Shader "Unlit/Opaque (Double Sided)"
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{
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Properties
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{
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_MainTex ("Texture", 2D) = "white" {}
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}
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SubShader
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{
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Tags { "Queue"="Geometry" "RenderType"="Opaque" }
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Cull Off
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma multi_compile_fog
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#pragma multi_compile_instancing
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#include "UnityCG.cginc"
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struct appdata
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct v2f
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{
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float2 uv : TEXCOORD0;
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UNITY_FOG_COORDS(1)
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float4 vertex : SV_POSITION;
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};
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sampler2D _MainTex;
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float4 _MainTex_ST;
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v2f vert(appdata v)
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{
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v2f o;
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UNITY_SETUP_INSTANCE_ID(v);
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = TRANSFORM_TEX(v.uv, _MainTex);
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UNITY_TRANSFER_FOG(o,o.vertex);
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return o;
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}
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fixed4 frag(v2f i) : SV_Target
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{
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fixed4 col = tex2D(_MainTex, i.uv);
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UNITY_APPLY_FOG(i.fogCoord, col);
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return col;
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}
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ENDCG
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}
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}
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}
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```
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前面のTextMesh ProオブジェクトのZ座標は背景から0.001ずらしたところ、ちょっと確認した限りでは見た目上の不自然さはなさそうでした。
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