This is a converter for a custom model format (.ro) used in my physically based real-time renderer that defines a list of vertices, their indices, paths to texture maps, and material metadata. This format is optimized for rapid consumption by the PBR renderer as the vertex/index section of the format is essentially the engine's in-memory representation of the model and can be directly read in to an array of Vertex structs in a single disk read.
The current format is as follows:
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[1 BYTE] An enum that describes which shader to use.
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0: Normalized Blinn-Phong
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1: [UNIMPLEMENTED] Cook-Torrance w/ GGX
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2: [UNIMPLEMENTED] Ashikhmin-Shirley
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[1 BYTE] Number of characters in the path to the albedo map (0 means no map).
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[N BYTES] The (null-terminated) cstring containing the path to the albedo map.
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[1 BYTE] Number of characters in the path to the metallic map (0 means no map).
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[N BYTES] The (null-terminated) cstring containing the path to the metallic map.
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[1 BYTE] Number of characters in the path to the roughness map (0 means no map).
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[N BYTES] The (null-terminated) cstring containing the path to the roughness map.
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[1 BYTE] Number of characters in the path to the normal map (0 means no map).
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[N BYTES] The (null-terminated) cstring containing the path to the normal map.
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[1 BYTE] Number of characters in the path to the ambient occlusion map (0 means no map).
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[N BYTES] The (null-terminated) cstring containing the path to the AO map.
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[4 BYTES] Number of vertices in the model.
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[N BYTES] The data corresponding to the vertices in the model. See the engine's Vertex struct for exact internal representation.
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[4 BYTES] Number of indices in the model.
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[N BYTES] The data corresponding to the indices in the model. This is an array of 32 bit ints.
./eo-converter input_mesh output_path input_map_matcher space_separated_list_of_map_types
where valid map types are: albedo, metallic, roughness, normal, and ao. For example, ./eo-converter lamp.fbx lamp.eo assets/lamp_*.png albedo metallic roughness normal which will create lamp.eo using the geometry found in lamp.fbx. The materials will use the imput map matcher, substituting strings like 'albedo', 'metallic', and 'roughness' for the wildcard character * in the input map matcher. In this case, we will use materials corresponding to assets/lamp_albedo.png, assets/lamp_roughness.png, etc.
This project depends on:
- assimp
Brian Ho