Record TTransformation
Unit
Declaration
type TTransformation = record
Description
Describe transformation in a way comfortable to apply it in both ways.
Overview
Fields
Transform: TMatrix4; 

InverseTransform: TMatrix4; 

Scale: Single; 

UniformScale: Boolean; 
Methods
procedure Init; 

procedure Multiply( const Center: TVector3; const Rotation: TVector4; const ScaleVector: TVector3; const ScaleOrientation: TVector4; const Translation: TVector3); overload; 

procedure Multiply( const Rotation: TVector4; const ScaleVector: TVector3; const Translation: TVector3); overload; 

procedure MultiplyMatrix(const Matrix: TMatrix4); 

procedure Translate(const Translation: TVector3); 
Description
Fields
Transform: TMatrix4; 

Transformation from local to outside coordinate space. 
InverseTransform: TMatrix4; 

Inverted Transform matrix. Note that any scale with zero component along the way will make this partially invalid (we'll substitute identity in place of inverted scaling matrix). This is unavoidable, there's no reverse matrix for scaling with zero factor, since one resulting point may correpond to infinitely many source points (i.e., it's natural that such scaling function cannot be reversed). 
Scale: Single; 

A uniform scale of the matrix Transform. If the matrix causes nonuniform scaling, this value represents an average scale. 
UniformScale: Boolean; 

Is the underlying scale uniform (which means that Scale accurately represents the scaling, is not only approximate). 
Methods
procedure Init; 

Make no transformation (identity matrix, scale 1). 
procedure Multiply( const Center: TVector3; const Rotation: TVector4; const ScaleVector: TVector3; const ScaleOrientation: TVector4; const Translation: TVector3); overload; 

Modify transformation by an additional translation, rotation, scaling. Multiplies at the same time transformation matrix in Transform, and it's inverse in InverseTransform. The precise meaning of Center, Translation and other parameters follows exactly the X3D Transform node definition (see http://www.web3d.org/files/specifications/197751/V3.2/Part01/components/group.html#Transform ). Parameters

procedure Multiply( const Rotation: TVector4; const ScaleVector: TVector3; const Translation: TVector3); overload; 

This item has no description. 
procedure MultiplyMatrix(const Matrix: TMatrix4); 

Modify transformation by an additional transformation matrix. Using this is very discouraged, as we need to assume UniformScale=false, which in turn e.g. makes sphere collisions worse (at some transformations, they have to treat sphere as something larger). That is because matrix can contain any transformation, and even using MatrixDecompose and then analyzing whether resulting scale has X=Y=Z would be unreliable. Testcases:  Rendering ghost teeth in castlegame. This shows that we cannot just replace matrix with translation+rotation+scale by MatrixDecompose, matrix can contain other transformations like shear. So we need to account whole matrix. Replacing  Graves on "The Gate" level in castlegame. This shows that even calculating UniformScale based on scale resulting from MatrixDecompose doesn't work reliably. Replacing inside  Beginng position (blocked movement) on "castle hall" level in castlegame. Same as above. Shows that we cannot detect UniformScale smartly. Use the Multiply instead to provide separate translation, rotation etc. vectors. Use this method only when you are forced to do so, i.e. your input is already a matrix. 
procedure Translate(const Translation: TVector3); 

Modify transformation by an additional translation. 
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