06-19-2015, 05:25 PM
The only 3D tool I have is Blender, which is a modelling program. It's free but will need some learning. https://www.blender.org/
I checked OBJ format here https://en.wikipedia.org/wiki/Wavefront_.obj_file and created the files with that knowledge. OBJ and MTL files are in human readable form so you could perhaps modify them with notepad once you figure out a better way. I might have missed something or perhaps programs have certain settings.
The blackness is related to texture transparency. These models are low poly so the geometry/polygons of wings are a parallelogram shape. They gave that feather tip looks simply by having transparent regions in the texture image file. I guess one program doesn't read the transparency correctly or perhaps there's a setting to turn it on&off.
The disappearance is because of one sided polygons. I don't think OBJ format supports double sided so faces will disappear from opposite direction. These are either manually handled (like copying certain polygons and reversing) or the program has an option to draw backfaces. Blender shows backfaces by default.
Apart from these I'm not sure what's the best way to handle these issues.
I checked OBJ format here https://en.wikipedia.org/wiki/Wavefront_.obj_file and created the files with that knowledge. OBJ and MTL files are in human readable form so you could perhaps modify them with notepad once you figure out a better way. I might have missed something or perhaps programs have certain settings.
The blackness is related to texture transparency. These models are low poly so the geometry/polygons of wings are a parallelogram shape. They gave that feather tip looks simply by having transparent regions in the texture image file. I guess one program doesn't read the transparency correctly or perhaps there's a setting to turn it on&off.
The disappearance is because of one sided polygons. I don't think OBJ format supports double sided so faces will disappear from opposite direction. These are either manually handled (like copying certain polygons and reversing) or the program has an option to draw backfaces. Blender shows backfaces by default.
Apart from these I'm not sure what's the best way to handle these issues.