You need to check what values these buffers generate and convert them in a reasonable normalized range as anything outside will get clamped to black or white when displayed as the render targets are floats they’re likely not suitable to display straight away. If you don’t know just try to get the values visualized to get an idea like gl_FragColor = vec4( vec3(abs(fract(value) )), 1.0 ); scaling down or up. The code is a bit messy to read honestly, what’s the purpose of this JSON conversion even
Also for correct ts normal map output @604 gl_FragColor = vec4(temp * 0.5 + 0.5, 1.0);
This might be helpful