I am adding gltf2 support to Cinder

vinjn · September 7, 2018, 4:18pm

The code is here https://github.com/jing-interactive/MeshViewer
Still in early stage, but it’s working.
I should have it completed in this month (2018-Sept)

vinjn · September 8, 2018, 10:07am

I am so productive

screenshot_2579

screenshot_2073

screenshot_1846

Malfunkn · September 8, 2018, 9:05pm

Very cool! It will be great to get the animation data working eventually too.

vinjn · September 11, 2018, 8:14am

More

Malfunkn · September 11, 2018, 10:33pm

For anyone else getting three unresolved external symbols for tinyGltf::WriteImageData for png jpg and bmp.
All you have to do is add, TINYGLTF_NO_STB_IMAGE_WRITE to Preprocessor.Definition.
Thanks Jing! Great work and looking good!

vinjn · September 14, 2018, 2:37am

tiny_obj_loader based OBJ loading is also added in this project, Cinder’s obj loader is sometimes too slow

notlion · October 13, 2018, 6:25pm

@vinjn I’ve also been working on a utility for rendering GLTF2 files parsed with tinygltf. It has support for rigid animations and up to 4 blend shapes per mesh.

I wasn’t intending to release it since the implementation is pretty specific for my use case, but the code is up in a Gist. Feel free to use it verbatim or as reference:

gist.github.com

https://gist.github.com/notlion/37f9ed06f0ec448057bd61e0fc88d996

gltf_primitive_pbr_fs.glsl

precision highp float;

// The PBR shader below is adapted from the Khronos glTF WebGL example:
// https://github.com/KhronosGroup/glTF-WebGL-PBR/blob/master/shaders/pbr-frag.glsl

struct PBRInfo {
    float NdotL; // cos angle between normal and light direction
    float NdotV; // cos angle between normal and view direction
    float NdotH; // cos angle between normal and half vector
    float LdotH; // cos angle between light direction and half vector

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gltf_primitive_pbr_vs.glsl

precision highp float;

// The TARGET macros here work around GLES3's lack of support for vertex shader attribute arrays.

#if TARGET_COUNT > 0
uniform float targetWeights[TARGET_COUNT];
#define DEF_TARGET_ATTRIBS(i)  \
    in vec3 targetPosition##i; \
    in vec3 targetNormal##i;
DEF_TARGET_ATTRIBS(0)

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gltf_utils.cpp

#include "gltf_utils.hpp"

#define TINYGLTF_NO_STB_IMAGE_WRITE
#define TINYGLTF_IMPLEMENTATION
#define STB_IMAGE_IMPLEMENTATION
#include "tiny_gltf.h"

#include "cinder/Log.h"
#include "cinder/app/App.h"
#include "cinder/gl/gl.h"

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ryan

vinjn · October 18, 2018, 1:25am

Looks promising, can you create a buildable project so that we can play with it?

vinjn · January 15, 2019, 5:54am

The code base is now split to a reusable lib and a sample.

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I am adding gltf2 support to Cinder

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