bero1985 / pasgltf Goto Github PK

Hello.
I have Lazarus 2.2.2 and FPC 3.2.2
I try to build but stoped - no PasDblStrUtils in '....\externals\pasdblstrutils\src\PasDblStrUtils.pas',
I git clone it and place to ....\externals\pasdblstrutils
Recomple
And I have an error

How to fix it?

One more question. Is pasgltf out with OpenGL or Vulkan?
Can output be with Vulkan? RTX also?

This unit does not compile under freepascal 3.0.4:
UnitOpenGLImagePNG.pas(259,9) Error: ENDIF without IF(N)DEF

Working around that, compilation later fails at UnitOpenGLImageJPEG:
UnitOpenGLImageJPEG.pas(237,16) Error: Identifier not found "TFPReaderJPEG"

There are glTF 2.0 extensions to define lights inside glTF file. It would be very useful for me (and Castle Game Engine :) ) if PasGLTF supported reading such lights.

1. Punctual lights (point, spot, directional) are defined in
   https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_lights_punctual .

   Blender can export such lights. I made example in CGE demo-models, https://github.com/castle-engine/demo-models/tree/master/gltf/punctual_lights . The test_lights.gltf inside defines 3 lights (point, spot, directional).

2. Image-based lighting is defined in
   https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/EXT_lights_image_based .

   Example of it is in
   https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/EnvironmentTest .

Loading a model from https://poly.google.com/view/9Vq_-HEtIHA (downloaded version using "Updated GLTF file") raises an error

Invalid GLTF document, missing "zfar" field

Indeed, glTF file doesn't specify zfar:

   "cameras" : [
      {
         "perspective" : {
            "yfov" : 0.7853981633974483,
            "znear" : 0.1000000014901161
         },
         "type" : "perspective"
      }
   ],

Looking at glTF 2.0 specification, zfar is not required for perspective cameras: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#reference-perspective . It says "Required: No" and "If zfar is undefined, runtime must use infinite projection matrix." . But PasGLTF requires it, by reading it through Required function,

result.fPerspective.fZFar:=TPasJSON.GetNumber(Required(....

on https://github.com/BeRo1985/pasgltf/blob/master/src/PasGLTF.pas#L4050 .

Also aspectRatio is not required, according to the glTF 2.0 specification, but PasGLTF code makes it required.

Note that zfar is still required for orthographic cameras, which may explain why this bug appeared :)