t3d-ibl-baker

This is a simple tool to bake IBL maps for t3d.js.

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Features

• Bake IBL maps from HDR and LDR images.
• Adjust the Y-axis rotation of IBL maps.
• Adjust the exposure of IBL maps. (coming soon)
• Export to .env file, optimized for t3d.js with smaller size and faster loading speed.
• Export to .hdr file.
• Export to .dds file. (coming soon)

ENV Format

The .env file is used to store baked IBL maps and can be loaded by t3d.js.

You can find the EnvLoader here: EnvLoader.

Format of the .env File (v1)

The .env File consists of three parts: Header, Json Data, and Buffer Data.

Header

The header of the .env File contains the following fields:

• version(4 bytes): The version of the .env File.
• jsonByteLength(4 bytes): The byte length of the Json Data.

Header's total length is 8 bytes.

Json Data

The Json Data is a JSON object containing the following fields:

• generator: The name of the generator.
• imageSize: The size of the IBL map at level 0.
• mipmaps: An array of mipmap information. The order is as follows: level0-posx, level0-negx, ..., levelN-negz. Each element contains:
  • length: The byte length of the current mipmap.
  • position: The byte position of the current mipmap, relative to the beginning of the body.

Buffer Data

The Buffer Data is binary data containing all mipmap data.

TODOs:

• Export spherical harmonics.
• Encoding type selection.
• Support explosure editing.
• Add DDS export.
• Add HDR export.