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OBAN : Object Animation
XML modding tips
  • See HERE to start learning about XML modding.
  • See HERE if you are searching for information on how to handle object coordinates.
  • See HERE for some typical modding errors and their causes.

Mtrl << Other file types >> OBOA

switch to OBD page

general information

  • The xml code on this page was tested with onisplit v0.9.61.0, v0.9.68.0, v0.9.82.0, v0.9.96.0

  • with v0.9.82.0 you can also convert the OBAN into a dae file
"-extract:dae output src\OBANElevator.oni" exports the animation with a null node
in Mod Tool the null node is named "unique" and holds keyframes; it can be replicated with activesceneroot.AddModel , "unique"
"-extract:dae output src\OBANElevator.oni -geom:M3GMdebris.oni" exports animation with specified geometry
"-extract:dae output src\OBANElevator.oni -geom:camera" exports animation with camera

  • with v0.9.90.0 you can convert a camera dae to OBAN (a camera root is not supported)
"-create:oban output src\file.dae"

  • laser triggers and door files use global OBAN files
  • some cutscene TRAM, animated cutscene objects and camera shots/animations use level specific OBAN files
  • if you want to update level-specific OBANs used by ONLV, you must provide the ONLV along the OBANs in the package
  • trivia: the Dream Lab images use OBANs
  • tutorial: making camera interpolations

BSL support

animate object animate character animate camera

env_setanim object_id oban_name

chr_animate [ai_name | script_id] anim_name [num_frames] [interp_frames]
chr_envanim [ai_name | script_id] anim_name [norotation]
chr_envanim_block [ai_name | script_id] anim_name [norotation]

cm_anim [look | move | both] oban_name

animate object (range) stop animated character interpolat between current and new camera position

env_anim object_id [object_id]

chr_envanim_stop ai_name
chr_envanim_stop script_id

cm_interpolate oban_name frame_number


tag type description
<OBAN id="0"> ID required. Unlike CJBO collections, this tag needs its id attribute to be set. Since it's the first and only instance it should be 0.
<Flags> flag
autostart animation (after an animated object is created
door OBAN use this
has Z axis pointing up
OBAN rotations and translations are treated relatively (they become added to door's spawn rotation/position)
<InitialTransform> matrix4x3 Initial position transform matrix, last 3 values are X, Y, Z position values. X, Y, Z seem to be always 0 (or nearly 0) in door OBAN files. That would make sense because of their global use.
<BaseTransform> matrix4x3 fixed transform matrix
<FrameLength> int16 fubared animation frame length (in 1/60 seconds); does not work
<FrameCount> int16 the value must be equal to the last <Time> value plus 1 because <Time>0</Time> is also a frame; Oni crashes if you use a wrong value for <FrameCount>
<HalfStopFrame> int16 stop frame for the first "half" of the animation; used by door animations to distinguish between open and close sequences
<KeyFrames> holds <OBANKeyFrame> tags
<Rotation> quaternion object rotation, can harvested from TRAM files
<Translation> vector3 x y z object position
<Time> int32 elapsed time in frames, use short intervals for smooth animations
Transform matrices
Like all matrices in Oni, they are composed of 3 vectors defining rotation/scaling/shearing and a 4th vector defining a translation.
In the above table the 4 vectors are presented as rows (Direct 3D convention), although OpenGL and Oni use them as columns.
Affine transformations use a 4x4 matrix with 4 extra coefficients (in the presentation above, one would add one column on the right):
three projection transform coefficients (all of them are zero here); one final coefficient (always 1.0 for an affine transform matrix).
Alternatively, one can think of the 3x4 matrix as a 3x3 rotation/scaling matrix and a position vector
  • Let X=(x, y, z) be the position of a vertex in the M3GM
  • Let M=(m11, m21, m31; m12, m22, m32; m13, m23, m33) be the 3x3 matrix
  • Let R=(m14, m24, m34) be the translation vector
Then the absolute position of the vertex in the 3D world will be: X M + R
(left multiplication is used because of the row-major notation above)
Initial transform matrix
It is used to position the object in the environment before the animation is played.
When the animation is played, they use the fixed transform matrix and a quaternion.
Fixed transform matrix
This transformation is applied before the quaternion+position transform at every keyframe.
The only transform that can't be handled by the quaternion+position is scaling/mirroring.
Thus, the fixed transform is a scaling matrix most of the time (no rotation or translation).
On the hex page, the fixed transform scales the van up by 1.82 (along all three axes).
Those are used in Oni whenever interpolation of 3D rotation is involved (e.g., TRAM rotation)
In this case, rotation at intermediate frames is interpolated from the keyframe quaternions.

code sample

[...] means other code blocks of <OBANKeyFrame>...</OBANKeyFrame>

<?xml version="1.0" encoding="utf-8"?>
   <OBAN id="0">
       <InitialTransform>1 0 0 0 1 0 0 0 1 -225 9.3 -778.5</InitialTransform>
       <BaseTransform>-1 0 0 0 -1 0 0 0 1 0 0 0</BaseTransform>
               <Rotation>1 1 1 1</Rotation>
               <Translation>-225 9.3 -778.5</Translation>
               <Rotation>1 1 1 1</Rotation>
               <Translation>-217 34.5 -778.5</Translation>

calculating a quaternion

An early attempt to harvest quaternions and positions from TRAM files with OniSplit v0.9.54.0 can be found over here.

But that script runs inside an Excel file and Excel isn't a free program nor is the code compatible with OpenOffice.

Vbs code pieces for Mod Tool can be found here:

calculating a transform matrix

In some scenarios we need to build a new transform matrix, e.g. when making a new weapon particle emitter.

The first 9 values belong to a 3x3 rotation matrix.

The last 3 values are the start positions.

single rotation matrices

x = 60

<InitialTransform>1 0 0 0 0.5    0.8660254 0 -0.8660254 0.5    0 0 0</InitialTransform>
                  1 0 0 0 cos(x) sin(x)    0 -sin(x)    cos(x)

y = 60

<InitialTransform>0.5    0 -0.8660254 0 1 0 0.8660254 0 0.5    0 0 0</InitialTransform>
                  cos(y) 0 -sin(y)    0 1 0 sin(y)    0 cos(y)

z = 60

<InitialTransform>0.5    0.8660254 0 -0.8660254 0.5    0 0 0 1 0 0 0</InitialTransform>
                  cos(z) sin(z)    0 -sin(z)    cos(z) 0 0 0 1

Neo provided a little matrix program.

The final rotation matrix becomes calculated from multiplication of all single rotation matrices whereby the order must be Z, then Y, then X.

Rotation matrix Z * rotation matrix Y * Rotation matrix X

So the transform matrix is:

final rotation matrix; position X; position Y; position Z

Mod Tool vbs code (rotations only):

wish list

  • TRAM import: dae + xml
    • the dae section in the xml file should have an option to create a pelvis OBAN along with the TRAM (see XML:TRAM, RealWorld flag for details)
  • dae to oni creation should also allow for OBANs (currently OBANs can only be imported via level master xml file)
    • this would be very useful for editing/creating single OBAN files if the rest of the level don't need changes

Camera OBAN creation with XSI

Watch out for drag and drop workflow. You better work with free object.

XML OBAN camera with XSI.jpg