Accessing and operating bones
(Difference between revisions)
(Created page with "Here's how you access and operate the '''bones''' of a ''mesh'' (MMesh). In this example I get the position of the bones, I set their position (both relative to the mesh ...") |
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| − | Here's how you access and operate the | + | Here's how you access and operate the [[MOBone|bones]] of a [[MMesh|mesh]]. |
| − | In this example I get the position of the bones, I set their position (both relative to the mesh and in world coordinates), and I rotate the bones. | + | In this example I get the position of the bones, I set their position (both relative to the mesh/parent and in world coordinates), and I rotate the bones. |
| − | The code as it is has no use of course, but you can use it as a starting point to make meaningful modifications to the mesh armature. | + | The code as it is has no use of course, but you can use it as a starting point to make meaningful modifications to the mesh [[MArmature|armature]]. |
<pre> | <pre> | ||
MEngine * engine = MEngine::getInstance(); // get the engine instance | MEngine * engine = MEngine::getInstance(); // get the engine instance | ||
Revision as of 16:08, 22 August 2013
Here's how you access and operate the bones of a mesh.
In this example I get the position of the bones, I set their position (both relative to the mesh/parent and in world coordinates), and I rotate the bones.
The code as it is has no use of course, but you can use it as a starting point to make meaningful modifications to the mesh armature.
MEngine * engine = MEngine::getInstance(); // get the engine instance
MLevel * level = engine->getLevel(); // get the current level
MScene * scene = level->getSceneByName("MyScene");
MOEntity * entity = scene->getEntityByName("MyEntity");
MOBone * bone;
MVector3 pos;
if(entity)
{ MMesh * mesh = entity->getMesh();
if(mesh)
{
MArmature * armature = mesh->getArmature();
if(armature)
{
unsigned int bones_number = armature->getBonesNumber();
for(unsigned int i=0; i < bones_number; i++)
{ bone = armature->getBone(i);
if(you want to GET the position of the bone)
{ //get position
MMatrix4x4 boneWorldMatrix = (*entity->getMatrix()) * (*bone->getMatrix());
pos = boneWorldMatrix.getTranslationPart();
}
else//, if you want to SET the position of the bone
{
if(you want to set the relative position)
{
pos = MVector3(0,0,0); //relative coordinates P(0,0,0)
bone->setPosition(pos);
}
else//, if you want to set the world position
{
pos = MVector3(0,0,0); //world coordinates P(0,0,0)
MObject3d * parentBone = bone->getParent();
MVector3 P_entity = entity->getInversePosition(pos); //entity space
if(parentBone)
{ MVector3 P_parent = parentBone->getInversePosition(P_entity); //bone parent space
bone->setPosition(P_parent);
}
else bone->setPosition(P_entity); //no parent so the bone is in entity space
}
}
//rotate the bone
bone->addAxisAngleRotation(MVector3(1, 0, 0), 10);
//update
//if you just get/set the position you won't need this; otherwise,
// and if there's no animations, you have to manually update the armature:
armature->processBonesLinking();
armature->updateBonesSkinMatrix();
}
}
}
