Fence texture from https://cc0textures.com/view?id=Fence007A with the following changes

fence-color.tga:
- Combined in Photoshop to multiply color*opacity and add alpha. 
- Then used ImageMagick to convert to tga to ensure uncompressed:
  - "magick fence-color.png -resize 512x512 -compress None fence-color.tga"

fence-normal.ppm
- Used NormalGL version of texture
- Converted to ppm using ImageMagick
  - "magick normal.png -resize 512x512 -depth 8 fence-normal.ppm"

fence-props.ppm
- Combines Roughness, Displacement, and AmbientOcclusion maps
  - "magick rough.png disp.png ao.png -combine -resize 512x512 fence-props.ppm"
