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Adds texture overrides for independent materials #242

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Adds texture overrides for independent materials #242

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Commits on Jul 7, 2020

  1. Adds texture overrides for independent materials 

    Allows passing a `materialOverrides` option to the `loadMtl` function.
When generating a new material parsed from the `.mtl` file the overrides
that are specific to this material are applied first before the global
material overrides already existing in the code. This allows the users
to specify different set of materials to override for a model. Following
is an example value for the `materialOverrides` key:

```
{
  "material1Name": {
    "alphaTexture": "path_to_the_texture_file",
    "ambientTexture": "path_to_the_texture_file",
    "diffuseTexture": "path_to_the_texture_file",
    "emissiveTexture": "path_to_the_texture_file",
    "normalTexture": "path_to_the_texture_file",
    "specularTexture": "path_to_the_texture_file",
    "specularShininessTexture": "path_to_the_texture_file",
  }
}
```

It's possible to define more than one material override. If the `.mtl`
file has materials that were not provided in the `materialOverrides`
option they are loaded from the `.mtl` file without any overrides.
    @YANOUSHek
    YANOUSHek committed Jul 7, 2020
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  2. Changes var to const

    @YANOUSHek
    YANOUSHek committed Jul 7, 2020
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  3. Fixes errors when materialOverrides is not passed to loadMtl

    @YANOUSHek
    YANOUSHek committed Jul 7, 2020
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