Moving Joints in Skinned Mesh

[andreasky]

In the 3D model I exported I did not called a node "head".

I also found out that I can manipulate joints via Irrlicht API only if my 3D model has a soft skin. If I choose a rigid skin I will not be able to manipualte joints.
Now I can manipualte joints.

[Sylence]

In the 3D model I exported I did not called a node "head".

Then why did you try to access a node called "head" ?

[andreasky]

Becasue in my first message I referred to the source code, reported below. Then I decided to try to write some code by myself.


======================================
// Irrlicht
#include <irrlicht.h>

using namespace irr;

using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;


#ifdef _IRR_WINDOWS_
#pragma comment(lib, "Irrlicht.lib")
#pragma comment(linker, "/subsystem:windows /ENTRY:mainCRTStartup")
#endif


// MAIN

int main()
{
// create Irrlicht device
IrrlichtDevice* device = createDevice( video::EDT_OPENGL, dimension2d<s32>(800, 600), 32,
false, false);

if (device == 0)
return 1; // could not create selected driver.

video::IVideoDriver* driver = device->getVideoDriver();
scene::ISceneManager* smgr = device->getSceneManager();

// create camera
smgr->addCameraSceneNodeFPS(0, 100.0f, .1f);

// Load Char
IAnimatedMesh* CharMesh = smgr->getMesh("../../media/dwarf.X");
if (!CharMesh) return 1;

IAnimatedMeshSceneNode* CharNode = smgr->addAnimatedMeshSceneNode( CharMesh );
if (!CharNode) return 1;

// Initilise
CharNode->setMaterialFlag(EMF_LIGHTING, false);
CharNode->setAnimationSpeed(10);

// Prepare for Joint Control
CharNode->setJointMode(EJUOR_CONTROL); //To write positions to the mesh on render



int lastFPS = -1;


f32 headRotation = 0;
f32 headPosition = 0;


while(device->run())
{

// Animate character manually
CharNode->animateJoints();


// Get the Joint you want to MANIPULATE, and its Parent
IBoneSceneNode* thisJoint = CharNode->getJointNode("head");

if( thisJoint )
{
ISceneNode* parentJoint = thisJoint->getParent();

if( parentJoint )
{
// Get the default (animated) Joint's position and rotation
vector3df jointPos = thisJoint->getAbsolutePosition();
vector3df jointRot = thisJoint->getAbsoluteTransformation().getRotationDegrees();

// Get the absolute INVERSE Transformation matrix of the parent
matrix4 iparentTransform = parentJoint->getAbsoluteTransformation();
iparentTransform.makeInverse();

// Set the Absolute Position or Rotation of the Joint without fear!
vector3df newJointPos = jointPos + vector3df( 0, 1+(sin(headPosition)*2), 0 );
vector3df newJointRot = vector3df( 0, headRotation, 0 );

// Transform the Position by the Parent's Inverse matrix before applying it
iparentTransform.transformVect( newJointPos );

// APPLY
thisJoint->setPosition( newJointPos );
thisJoint->setRotation( newJointRot );
}
}


// funny
headPosition += 0.01f;
if( headPosition > 2*PI ){ headPosition -= 0; }

headRotation += 0.5f;
if( headRotation > 360 ){ headRotation -= 360; }


// do Irrlicht stuff

driver->beginScene(true, true, video::SColor(255,113,113,133));

smgr->drawAll(); // draw the 3d scene
device->getGUIEnvironment()->drawAll(); // draw the gui environment (the logo)

driver->endScene();

int fps = driver->getFPS();

if (lastFPS != fps)
{
core::stringw tmp(L"fmx's funny dwarf head joint manipulation demo! [");
tmp += driver->getName();
tmp += L"] fps: ";
tmp += fps;

device->setWindowCaption(tmp.c_str());
lastFPS = fps;
}
}


// show cursor
// device->getCursorControl()->setVisible(true);



device->drop();

return 0;
}
======================================

[andreasky]

I still have a problem:

I would like to see an animation I imported in Irrlicht through cvxporter in ".X" format.

Do you know how to export a joint animation and play it through "IAnimatedMeshSceneNode::animateJoints"?

I selected the Animation option in cvxporter. I inserted also the start frame and end frame, that is from frame 1 to frame 90. However I cannot see my animation running. I tried with both "SRT" and "Matrix" option.