Merge pull request #1145 from savuor:rv/ply_mesh

Connected PR: [#24961@main](opencv/opencv#24961)

Author: savuor

testdata/pointcloudio/orig_ascii_fidx.ply

@@ -0,0 +1,39 @@
+ply
+format ascii 1.0
+comment VCGLIB generated
+element vertex 8
+property float x
+property float y
+property float z
+property float nx
+property float ny
+property float nz
+property int flags
+property uchar red
+property uchar green
+property uchar blue
+property uchar alpha
+element face 12
+property list uchar int vertex_indices
+property int flags
+end_header
+-1 -1 1 -1.570796 -1.570796 1.570796 0 12 29 67 255 
+-1 1 1 -1.570796 1.570796 1.570796 0 137 174 194 255 
+-1 1 -1 -1.570796 1.570796 -1.570796 0 164 152 129 255 
+1 1 1 1.570796 1.570796 1.570796 0 179 162 122 255 
+1 1 -1 1.570796 1.570796 -1.570796 0 97 172 125 255 
+1 -1 1 1.570796 -1.570796 1.570796 0 59 82 121 255 
+1 -1 -1 1.570796 -1.570796 -1.570796 0 136 52 226 255 
+-1 -1 -1 -1.570796 -1.570796 -1.570796 0 23 32 29 255 
+3 0 1 2 0 
+3 1 3 4 0 
+3 3 5 6 0 
+3 0 7 5 0 
+3 7 2 4 0 
+3 5 3 1 0 
+3 7 0 2 0 
+3 2 1 4 0 
+3 4 3 6 0 
+3 5 7 6 0 
+3 6 7 4 0 
+3 0 5 1 0 

testdata/pointcloudio/orig_ascii_vidx.ply

@@ -0,0 +1,38 @@
+ply
+format ascii 1.0
+comment VCGLIB generated
+element vertex 8
+property float x
+property float y
+property float z
+property float nx
+property float ny
+property float nz
+property int flags
+property uchar red
+property uchar green
+property uchar blue
+property uchar alpha
+element face 12
+property list uchar int vertex_indices
+end_header
+-1 -1 1 -1.570796 -1.570796 1.570796 0 12 29 67 255 
+-1 1 1 -1.570796 1.570796 1.570796 0 137 174 194 255 
+-1 1 -1 -1.570796 1.570796 -1.570796 0 164 152 129 255 
+1 1 1 1.570796 1.570796 1.570796 0 179 162 122 255 
+1 1 -1 1.570796 1.570796 -1.570796 0 97 172 125 255 
+1 -1 1 1.570796 -1.570796 1.570796 0 59 82 121 255 
+1 -1 -1 1.570796 -1.570796 -1.570796 0 136 52 226 255 
+-1 -1 -1 -1.570796 -1.570796 -1.570796 0 23 32 29 255 
+3 0 1 2 
+3 1 3 4 
+3 3 5 6 
+3 0 7 5 
+3 7 2 4 
+3 5 3 1 
+3 7 0 2 
+3 2 1 4 
+3 4 3 6 
+3 5 7 6 
+3 6 7 4 
+3 0 5 1