_{Half-Life engine map compile tools based on SDHLT, VHLT, and ZHLT.}

TODO: Describe new features and improvements in OHLT here New features such as MacOS support, -fallback-encoding

New features in SDHLT include shadows from studiomodels, new entities, additional tool textures, ability to extend world size limits, portal file optimisation for J.A.C.K. map editor and minor algorithm optimization.

cmake -S . --preset=release-default
cmake --build --preset=release-default

1. Open the configuration dialog of your map editor or batch compiler.
2. Set CSG, BSP, VIS, RAD tool paths to hlcsg.exe, hlbsp.exe, hlvis.exe, and hlrad.exe.
3. Add hlt.wad to your WAD list. This is required to compile maps.
4. Add hlt.fgd to your FGD list.

These are from SDHLT. A new feature list will be written for OHLT.

Entities with a model keyvalue, such as env_sprite or cycler_sprite, support the use of zhlt_studioshadow 1 to flag the studiomodel as opaque to lighting. Additionally, zhlt_shadowmode n is used to control the shadow tracing mode.
The default 1 will trace for each triangle and supports transparent textures.
Setting 2 doesn't support transparency, but it traces the planes bbox for each triangle, the slowest but usually higher quality for some models.
Setting 0 disables tracing and uses the mesh bbox instead.

To implement these into your own fgd file for SmartEdit, use the template at the top of hlt.fgd. If the new shadow covers the origin and makes it too dark, set a custom light_origin on the entity or move the mesh origin point externally.

• info_portal and info_leaf are used to create a portal from the leaf the info_portal is inside, to the selected leaf the info_leaf is inside. Forces target leaf to be visible from the current one, making all entities visible.
• info_minlights used to set minlights for textures, works on world geometry too. Works similarly to _minlight but per-texture.

• Support for % texture flag, sets the minlight for this texture. %texname alone is equivalent to _minlight 1.0, while %#texname where # is an integer in a range of 0-255.
• BEVELHINT texture, which acts like SOLIDHINT and BEVEL. Eliminates unnecessary face subdivision and bevels clipnodes at the same time. Useful on complex shapes such as terrain, spiral staircase clipping, etc.
• SPLITFACE texture. Brushes with this texture will subdivide faces they touch along their edges, similarly to zhlt_chopdown.
• cur_tool textures, which act like CONTENTWATER and func_pushable with a speed of 2048 units/s in -Y. This texture is always fullbright.

• -extra RAD parameter now sets -bounce 12 for a higher quality of lighting simulation.
• -worldextent n CSG parameter. Extends map geometry limits beyond +/-32768.
• Portal file reformatting for J.A.C.K. map editor, allows for importing the prt file into the editor directly after VIS. Use -nofixprt VIS parameter to disable.
• -nostudioshadow RAD parameter to ignore zhlt_studioshadow on studiomodels.

These compile tools contain code by various people including Oskar Larsson Högfeldt AKA Oskar_Potatis, Sean "Zoner" Cavanaugh, Ryan "Nemesis" Gregg, amckern, Tony "Merl" Moore, Vluzacn, Uncle Mike, and seedee. Based on Valve's compile tools, modified with permission.