The Use Custom Font variable controls whether a Text object uses a premade .fnt file (if true) or if it Gum automatically creates font files according to the Text's Font, Font Size, and Outline Thickness variables.
Use Custom Font is false by default.
If Use Custom Font is set to true, then Gum displays the Custom Font File variable, which can point to a .fnt file created by Bitmap Font Generator.
If Use Custom Font is set to true, then the Font, Font Size, and Outline Thickness variables can no longer be set - as they are part of the font file itself.
The Font Scale variable is still available when using custom fonts.
To set a custom font
Click the ... button
Navigate to the location of the desired .fnt file
Select the file and click Open
Custom font files are .fnt files created by BitmapFontGenerator. Gum automatically creates .fnt files whenever a font value changes when UseCustomFonts is unchecked.
The .fnt file format used by Gum is the Angelcode BitmapFontGenerator format. This can be produced by a number of applications. Note that this is not the same as the old .fnt extension used for Windows fonts. https://docs.fileformat.com/font/fnt/
To create your own font file:
Download Bitmap Font Generator from https://angelcode.com/products/bmfont/
Select Options -> Font Settings
Use the dropdown to select the font you would like to use. All .ttf files installed on the current machine should appear in the dropdown. If you would like to install a new .ttf, restart Bitmap Font Generator after installing the font.
After changing the settings, click OK
Select which characters you would like included in your font. Adding characters can increase the font size, but may be required depending on which characters you intend to use.
Select Options->Export Options
Select a Bit depth of 32 (or else transparencies won’t come through).
Select the texture width and height. For best performance, select a size which will contain all of the characters you have selected. Also, many game engines prefer textures which are power of two such as 256, 512, 1024, or 2048. Sizes larger than 2048 may not render properly on some hardware.
Change the Textures option to png – Portable Network Graphics
Be sure to keep the Font descriptor as Text.
Press OK to apply the changes
Also, note that if you are using outline, you will want to have the following values:
A: outline
R: glyph
G: glyph
B: glyph
You can verify that the settings will produce a proper PNG by selecting Options -> Visualize. If you see “No Output!” then you need to select characters to export. See the above step for more information.
To save the font, select Options->Save bitmap font as… to save your .fnt and .png files.
Once you have saved your files, you can select the .fnt to use in your project.
The Hiero tool can also be used to generate .fnt files:
To generate a font:
Download and open the Hiero tool
Set the values needed for your font, such as font type, size, and effects
Select File -> Save BMFont Files (text)...
Select the location to save the files, such as in your project's Contents folder, or the subfolder which contains your Gum project
This .fnt file can now be loaded in the Gum tool or in code just like any other .fnt file.
