Add backpack editor startup scene

project/Assets/Models/backpack/backpack.mtl

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+# Blender MTL File: 'None'
+# Material Count: 1
+
+newmtl Scene_-_Root
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.0 0.0 0.0
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd diffuse.jpg
+map_Bump normal.png
+map_Ks specular.jpg
+

project/Assets/Models/backpack/source_attribution.txt

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+Model by Berk Gedik, from: https://sketchfab.com/3d-models/survival-guitar-backpack-low-poly-799f8c4511f84fab8c3f12887f7e6b36
+
+Modified material assignment (Joey de Vries) for easier load in OpenGL model loading chapter, and renamed albedo to diffuse and metallic to specular to match non-PBR lighting setup.

project/Assets/Scenes/Main.xc

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+# XCEngine Scene File
+scene=Main Scene
+active=1
+
+gameobject_begin
+id=1
+uuid=11806343893082442755
+name=Main Camera
+active=1
+parent=0
+transform=position=0,0,0;rotation=0,0,0,1;scale=1,1,1;
+component=Camera;projection=0;fov=45;orthoSize=5;near=0.1;far=100;depth=0;primary=1;clearColor=0.05,0.05,0.08,1;
+gameobject_end
+
+gameobject_begin
+id=2
+uuid=1695101543211549096
+name=BackpackRoot
+active=1
+parent=0
+transform=position=0,0.08,3;rotation=0,0,0,1;scale=1,1,1;
+gameobject_end
+
+gameobject_begin
+id=3
+uuid=9855370671540411784
+name=BackpackRotateY
+active=1
+parent=2
+transform=position=0,0,0;rotation=0,-0.174108138,0,0.984726539;scale=1,1,1;
+gameobject_end
+
+gameobject_begin
+id=4
+uuid=14568936532392398358
+name=BackpackRotateX
+active=1
+parent=3
+transform=position=0,0,0;rotation=-0.0898785492,0,0,0.995952733;scale=1,1,1;
+gameobject_end
+
+gameobject_begin
+id=5
+uuid=7319598685716776031
+name=BackpackScale
+active=1
+parent=4
+transform=position=0,0,0;rotation=0,0,0,1;scale=0.389120452,0.389120452,0.389120452;
+gameobject_end
+
+gameobject_begin
+id=6
+uuid=14495577888798577643
+name=BackpackMesh
+active=1
+parent=5
+transform=position=0.048938,-0.5718905,-0.943127;rotation=0,0,0,1;scale=1,1,1;
+component=MeshFilter;mesh=Assets/Models/backpack/backpack.obj;
+component=MeshRenderer;materials=;castShadows=1;receiveShadows=1;renderLayer=0;
+gameobject_end
+