panda3d-simplepbr

• Use a constant shadow bias and switch shadows to using front faces
• Add support for calculating the blue/Z channel of a normal map in the shader
• Fix IBL reflection vector (was using view-space vector instead of world-space)
• Fix 330 shaders being used when not requested
• Some fixes for WebGL (GLSL ES)
• Fix duplicate definition in tonemap.frag that could cause compile errors
• Fix potential compile issue with non-330 shaders when calculating shadow contributions
• Explicitly disable sRGB for HDR framebuffer
• Fix IBL lagging behind by a frame

• Fix use_330 defaulting to True instead of None

• Add support for post-tonemap, SDR, color LUT transform
• Add support for using HDR cubemaps for IBL diffuse and specular
• Add simplepbr DirectNotify category to provide better control over logging
• Add type annotations and mark package as being typed
• Add simplepbr.utils.make_sky_box() to create a skybox NodePath from a cubemap texture
• Add support for setting initial Pipeline parameters from PRC config variables
• Default enable_shadows to True
• Fix using texture2D/3D() instead of texture() when using GLSL 330 shaders
• Fix error when a DisplayRegion is missing a camera
• Fix shadows being delayed by a frame
• Fix TextNode.set_text_color() not working
• Fix possible divide-by-zero in Smith GGX visibility function (fixes some visual artifacts)
• Fix metallics not responding to ambient lighting
• Fix possible shader compile error for duplicate defines
• Fix objects rendering black if they do not have a material (there is now a default material)
• Fix ShowBase.set_background_color() not working after simplepbr.init()

• Fix normals when using hardware skinning
• Fix hardware skinning when using GLSL 120 shaders
• Stop enabling the auto shader on TextNodes
• Improve performance of get_all_casters()
• Fix gl_FragColor warnings for shadow and tonemap shaders
• Bundle shaders into a shader.py module when building wheels

• Fix finding shaders on macOS
• Fix warnings and errors when using GLSL 330 shaders
• Use semantic texture slots (texture stages) instead of texture indices

• Add light attenuation
• Allow updating render_node, window, and camera_node properties after setup
• Add use_330 option to control using GLSL 330 shaders instead of GLSL 120
• Support texture transforms
• Add hardware skinning
  • Enabled by default on OpenGL 3.2+ capable hardware
  • Can be controlled with use_hardware_skinning option

Note: Panda3D 1.10.8+ is now required

• Fixes for shader/rendering artifacts
  • Clamp NdotL and NdotV to 0.0
  • Fix GGX/Trowbridge-Reitz equation for normal distribution function
  • Fix normalization of normal vector in the fragment shader
• Optimizations
  • Use a dedicated shadow shader to avoid expensive PBR functions (mostly helps Intel)
  • Remove Fresnel term from diffuse (i.e., use simple Lambertian)
  • Use Spherical Gaussian approximation in the Fresnel equation
• Automatically enable auto shader on TextNodes found in the scene graph (fixes TextNode rendering)

• Ensure AntialiasAttrib is set on the render NodePath (ensures MSAA works if enabled)
• Support occlusion maps in the red channel of an occlusion-metal-roughness (ORM) map
• Fix ambient lights
• Support emission maps
• Shaders moved to their own directory

• Name structs to improve compatibility with Intel drivers
• Support p3d_ColorScale (modifies the base color)
• Allow users to set an exposure value
• Allow changing max_lights, use_normal_maps, msaa_samples, and exposure at runtime
• Add basic shadow map support for DirectionalLight and Spotlight (NOTE: This breaks if a PointLight is present, and must be explicitly enabled)
• Add exponential fog (must be explicitly enabled since fog density does not default to 0)

• Add support for vertex colors (from @rdb)

• Optimize lighting calculations for slight performance improvements
• Stop calculating lighting for unused lights (can be a huge savings if using few lights)
• Add support for ambient lights
  • NOTE: These are not physically accurate, but can still be useful
• Add initial support for normal maps
  • Disabled by defaults since it requires models with properly defined tangents
• Various fixes related to material roughness from @el-dee
• Fix transparency (the alpha channel from the base color texture is now being used)

• Another Windows path fix

• Remove debug print that dumped out the PBR fragment shader

• Fix paths to shaders on Windows

• Improve support for drivers/GPUs that only support EXT_framebuffer_object and not ARB_framebuffer_object
• Allow specifying the maximum number of lights to support via new max_lights kwarg (defaults to 8)
• Add support for MSAA that can be controlled via a new msaa_samples kwarg (defaults to 4)

Initial release