[SOLVED] Need more document about WorldExpression

[steve3d]

WorldExpression seems to be very easy, but I can not find any document about how to use it, and what internal functions will be avalible. So far, I only know the getNode function can get reference to the worldexpression node, are there any more functions?

[frustum]

getNode() returns WorldExpression.

getParent() returns parent of WorldExpression node.

getNumChilds() returns number of WorldExpression children.

getChild(int num) returns specified WorldExpression child.

[ulf.schroeter]

WorldExpression seems to be very easy, but I can not find any document about how to use it, and what internal functions will be avalible. So far, I only know the getNode function can get reference to the worldexpression node, are there any more functions?

 

Maybe small WorldExpression sample usage for time-based animation of ObjectMeshSkinned child node bone animation is helpful. Sample simply gets access to ObjectMeshSkinned via getChild() and animates different parts of the vehicle. time variable value is globally availabe within expressions.

 

 

World expression code

{
Node node = getChild(0);
ObjectMeshSkinned mesh = class_cast(node.getTypeName(),node);	

int numLayers = mesh.getNumLayers();
int numBones  = mesh.getNumBones();

for( int j=0; j<numLayers; j++ )
{
for( int i=0; i<numBones; i++ )
{
	string boneName = mesh.getBoneName(i);

	mat4 boneTransform = mesh.getFrameBoneTransform(i);
	vec3 bonePivot = boneTransform.m03m13m23;

	if( strcmp( boneName,"wheel_left_0" ) == 0 || strcmp( boneName,"wheel_right_0" ) == 0 )
	{
		boneTransform =  translate( bonePivot ) * rotateZ( 20.0 * sin(3*time) ) * rotateX( -300 * time ) ;
	}
	else if( strncmp( boneName,"wheel",5 ) == 0 )
	{
		boneTransform =  translate( bonePivot ) * rotateX( -300 * time );
	}
	else if( strcmp( boneName, "hatch" ) == 0 )
	{
		boneTransform =  translate( bonePivot ) * rotateY( -60.0 * ( 1 + sin( time )  ) );
	}
	else if( strcmp( boneName, "engine_hood" ) == 0 )
	{
		boneTransform =  translate( bonePivot ) * rotateX( -35.0 * ( 1 + sin( time + 1.0 )  ) );
	}
	else if( strcmp( boneName, "mg_1" ) == 0 )
	{
		boneTransform =  translate( bonePivot ) * rotateZ( 30.0 * sin( time + 1.0 ) );
	}
	else if( strcmp( boneName, "wiper_left" ) == 0 )
	{
		boneTransform =  translate( bonePivot ) * rotateY( 55 * sin( time ) +45  );
	}
	else if( strcmp( boneName, "wiper_right" ) == 0 )
	{
		boneTransform =  translate( bonePivot ) * rotateY( 55 * sin( time ) +45  );
	}
	else if( strcmp( boneName, "door_left_0" ) == 0 )
	{
		boneTransform =  translate( bonePivot ) * rotateZ( -40.0 * ( 1 + sin( time )  ) );
	}

	mesh.setFrameBoneTransform( i, boneTransform );
}
}

}

[steve3d]

Thank you :)

[ulf.schroeter]

getNode() returns WorldExpression.

getParent() returns parent of WorldExpression node.

getNumChilds() returns number of WorldExpression children.

getChild(int num) returns specified WorldExpression child.

@UNIGINE: Availability of these functions within WorldExpression script should be included into documentation.

[binstream]

https://developer.unigine.com/en/docs/1.0/scripting/library/worlds/class.worldexpression