Sonic Heroes/Spline Editing

SCHG: Sonic Heroes
Main Article
Mechanic Editing
DOL Editing EXE Editing Music Pointers Object Parameter Data Relocatable Editing (PC) File Offsets
Model Editing
Collision Format Model Format
Level Editing
Camera Editing Event Editing ID list Indirect Editing Light Editing Level List Object Editing Object Porting Spline Editing Texture Animation Editing Visibility Editing
Particle Editing
Particle Editing
Sound Editing
Music List Sound Editing Voices
SCHG How-Tos
Custom Object Material Effect Tutorial Level Editing Tutorial

SPL splines are found in many places in Sonic Heroes. Splines such as rails and autoloops are not in SPL format, those instead are in the executable; paths used for Falcos (similar to splines) are animations found in every stage flyer archives. SPLs are found directly in the dvdroot folder or in ONE archives, and contain data for special stage splines, automated camera sections, and many objects such as flowers/propellers and the alligator in Frog Forest and Lost Jungle.

Format

The file is little endian. It's a Renderware binary stream file with just one section.

int32 sectionType // 0C 00 00 00
int32 sectionSize // number of bytes in file -0x0C
int32 renderWareVersion // always FF FF 00 14 in Heroes
int8[20] null
int32 amountOfPoints // get total number of bytes in file, subtract 0x34 and divide by 0x0C
int32 unknown // always 01 00 00 00
vertex3[amountOfPoints] vertices

// vertex3: 0x0C bytes
float32 X
float32 Y
float32 Z

Tools

Heroes SPL Editor can convert between SPL and OBJ which can be imported/exported from 3d model editors.