Example #1
0
/*!
SLCurveBezier::subdivideRender adds points along the curve to the point vector
renderPoints by recursively subdividing the curve with the Casteljau scheme.
*/
void SLCurveBezier::subdivideRender(SLVVec3f &renderPoints,
                                    const SLMat4f &wm,
                                    SLfloat epsilon,
                                    const SLVec3f& P0, const SLVec3f& P1, 
                                    const SLVec3f& P2, const SLVec3f& P3)
{
    // add first point transformed by wm if not already in the list
    if (renderPoints.size()==0)
        renderPoints.push_back(wm.multVec(P0));
    else if (P0 != renderPoints[renderPoints.size()-1])
        renderPoints.push_back(wm.multVec(P0));
   
    // check to see if basically straight
    SLfloat Lmin = P0.distance(P3);
    SLfloat Lmax = P0.distance(P1) + P1.distance(P2) + P2.distance(P3);
    SLfloat diff = Lmin - Lmax;
    if (diff*diff < epsilon) return;

    // otherwise get control points for subdivision
    SLVec3f L1  = (P0 + P1) * 0.5f;
    SLVec3f H   = (P1 + P2) * 0.5f;
    SLVec3f L2  = (L1 + H)  * 0.5f;
    SLVec3f R2  = (P2 + P3) * 0.5f;
    SLVec3f R1  = (H  + R2) * 0.5f;
    SLVec3f mid = (L2 + R1) * 0.5f;

    // subdivide
    subdivideRender(renderPoints, wm, epsilon, P0, L1, L2, mid);
    subdivideRender(renderPoints, wm, epsilon, mid, R1, R2, P3);
}
Example #2
0
//-----------------------------------------------------------------------------
//! Gets called whenever the mouse is moved.
SLbool SLCamera::onMouseMove(const SLMouseButton button, 
                             const SLint x, const SLint y, const SLKey mod)
{  
    if (button == ButtonLeft) //================================================
    {   
        // new vars needed
        SLVec3f position = this->translation();
        SLVec3f forward =  this->forward();
        SLVec3f right =    this->right();
        SLVec3f up =       this->up();

        // The lookAt point
        SLVec3f laP = position + _focalDist * forward;

         
        // Determine rotation point as the center of the AABB of the hitNode
        SLVec3f rtP;
        if (_lookAtRay.length < FLT_MAX && _lookAtRay.hitNode)
             rtP = _lookAtRay.hitNode->aabb()->centerWS();
        else rtP = laP;
              
        // Determine rot angles around x- & y-axis
        SLfloat dY = (y-_oldTouchPos1.y) * _rotFactor;
        SLfloat dX = (x-_oldTouchPos1.x) * _rotFactor;

        if (_camAnim==turntableYUp) //.......................................
        {
            SLMat4f rot;
            rot.translate(rtP);
            rot.rotate(-dX, SLVec3f(0,1,0));
            rot.rotate(-dY, right);
            rot.translate(-rtP);
			
            _om.setMatrix(rot * _om);
            needWMUpdate();
        }
        else if (_camAnim==turntableZUp) //..................................
        {
            SLMat4f rot;
            rot.translate(rtP);
            rot.rotate(dX, SLVec3f(0,0,1));
            rot.rotate(dY, right);
            rot.translate(-rtP);
         
            _om.setMatrix(rot * _om);
            needWMUpdate();
        }
        else if (_camAnim==walkingYUp) //....................................
        {
            dY *= 0.5f; 
            dX *= 0.5f; 
            
            SLMat4f rot;
            rot.rotate(-dX, SLVec3f(0, 1, 0));
            rot.rotate(-dY, right);

            forward.set(rot.multVec(forward));
            lookAt(position + forward);
        }
        else if (_camAnim==walkingZUp) //....................................
        {
            dY *= 0.5f; 
            dX *= 0.5f; 
            
            SLMat4f rot;
            rot.rotate(-dX, SLVec3f(0, 0, 1));
            rot.rotate(-dY, right);

            forward.set(rot.multVec(forward));
            lookAt(position + forward, SLVec3f(0, 0, 1));
        }
        
        _oldTouchPos1.set((SLfloat)x,(SLfloat)y);
    } 
    else
    if (button == ButtonMiddle) //==============================================
    {   if (_camAnim==turntableYUp || _camAnim==turntableZUp)
        {  
            // Calculate the fraction delta of the mouse movement
            SLVec2f dMouse(x-_oldTouchPos1.x, _oldTouchPos1.y-y);
            dMouse.x /= (SLfloat)_scrW;
            dMouse.y /= (SLfloat)_scrH;
         
            // Scale the mouse delta by the lookAt distance
            SLfloat lookAtDist;
            if (_lookAtRay.length < FLT_MAX)
                lookAtDist = _lookAtRay.length;
            else lookAtDist = _focalDist;

            // scale factor depending on the space sice at focal dist
            SLfloat spaceH = tan(SL_DEG2RAD*_fov/2) * lookAtDist * 2.0f;
            SLfloat spaceW = spaceH * _aspect;

            dMouse.x *= spaceW;
            dMouse.y *= spaceH;
         
            if (mod==KeyCtrl)
            {
                translate(SLVec3f(-dMouse.x, 0, dMouse.y), TS_Object);

            } else
            {
                translate(SLVec3f(-dMouse.x, -dMouse.y, 0), TS_Object);
            }
            _oldTouchPos1.set((SLfloat)x,(SLfloat)y);
        }
    } //========================================================================
    return true;
}
Example #3
0
/*! 
SLCurveBezier::draw does the OpenGL rendering of the Bezier curve in world 
space.
*/
void SLCurveBezier::draw(const SLMat4f &wm)
{  
    SLint numControlPoints = 2*((SLint)_points.size()-1);

    // Create buffer object
    if (!_vao.id())
    {  
        // Build renderPoints by recursively subdividing the curve
        SLVVec3f renderPoints;
        for (SLuint i = 0; i < _points.size()-1; ++i)
        {   subdivideRender(renderPoints, wm, 0.00001f, 
                            _points[i].vec3(), _controls[2*i], 
                            _controls[2*i+1], _points[i+1].vec3());
        }
   
        // add last point to the curve vector
        renderPoints.push_back(wm.multVec(_points[_points.size()-1].vec3()));

        // add inputs points
        for (SLuint i = 0; i < _points.size(); ++i)
            renderPoints.push_back(wm.multVec(_points[i].vec3()));
      
        // add control points
        for (SLint i = 0; i < numControlPoints; ++i)
            renderPoints.push_back(wm.multVec(_controls[i]));

        // add tangent points
        for (SLint i = 0; i < numControlPoints; ++i)
        {   renderPoints.push_back(wm.multVec(_controls[i]));
            int iPoint = (SLint)((SLfloat)i/2.0f + 0.5f);
            renderPoints.push_back(wm.multVec(_points[iPoint].vec3()));
        }
      
        // Generate finally the OpenGL rendering buffer
        _vao.generateVertexPos(&renderPoints);
    }
   
    if (!_vao.id()) return;

    // Set the view transform
    SLGLState* stateGL = SLGLState::getInstance();
    stateGL->modelViewMatrix.setMatrix(stateGL->viewMatrix);

    SLint numTangentPoints = numControlPoints * 2;
    SLint numCurvePoints = _vao.numVertices() -
                           (SLint)_points.size() - numControlPoints - numTangentPoints;
   
    // Draw curve as a line strip through interpolated points
    _vao.drawArrayAsColored(PT_lineStrip, SLCol3f::RED, 1, 0, numCurvePoints);
   
    // ES2 has often problems with rendering points
    #ifndef SL_GLES2
    // Draw curve as a line strip through interpolated points
    _vao.drawArrayAsColored(PT_points, SLCol4f::RED, 3, 0, numCurvePoints);

    // Draw input points
    _vao.drawArrayAsColored(PT_points, SLCol4f::BLUE, 6, 
                            numCurvePoints, (SLuint)_points.size());

    // Draw control points
    _vao.drawArrayAsColored(PT_points, SLCol4f::YELLOW, 6,
                            numCurvePoints + (SLuint)_points.size(), 
                            numControlPoints);

    // Draw tangent points as lines
    _vao.drawArrayAsColored(PT_lines, SLCol4f::YELLOW, 1,
                            numCurvePoints + (SLint)_points.size() + numControlPoints, 
                            numTangentPoints);
    #endif
}