/** * Build a 4x4 matrix transform, according to the gluLookAt function. * * @param aEye * @param aLookAt * @param aUp */ public void buildLookAtMatrix(JVector3d aEye, JVector3d aLookAt, JVector3d aUp) { buildLookAtMatrix( aEye.getX(), aEye.getY(), aEye.getZ(), aLookAt.getX(), aLookAt.getY(), aLookAt.getZ(), aUp.getX(), aUp.getY(), aUp.getZ()); }
public static void jLookAt(GL2 gl, JVector3d eye, JVector3d at, JVector3d up) { // Define our look vector (z axis) JVector3d look = at.operatorSub(eye); look.normalize(); // Define our new x axis JVector3d xaxis = JMaths.jCross(look, up); xaxis.normalize(); // Define our new y axis as the cross of the x and z axes JVector3d upv = JMaths.jCross(xaxis, look); // Turn around the z axis look.mul(-1.0); // Put it all into a GL-friendly matrix double[] dm = new double[16]; dm[0] = xaxis.getX(); dm[1] = xaxis.getY(); dm[2] = xaxis.getZ(); dm[3] = 0.f; dm[4] = upv.getX(); dm[5] = upv.getY(); dm[6] = upv.getZ(); dm[7] = 0.f; dm[8] = look.getX(); dm[9] = look.getY(); dm[10] = look.getZ(); dm[11] = 0.f; dm[12] = eye.getX(); dm[13] = eye.getY(); dm[14] = eye.getZ(); dm[15] = 1.f; // Push it onto the matrix stack gl.glMultMatrixd(dm, 0); }
/** * Creates OpenGL translation matrix from a position vector passed as parameter. * * @param aPos */ public void set(final JVector3d aPos) { m[0][0] = 1.0; m[0][1] = 0.0; m[0][2] = 0.0; m[0][3] = 0.0; m[1][0] = 0.0; m[1][1] = 1.0; m[1][2] = 0.0; m[1][3] = 0.0; m[2][0] = 0.0; m[2][1] = 0.0; m[2][2] = 1.0; m[2][3] = 0.0; m[3][0] = aPos.getX(); m[3][1] = aPos.getY(); m[3][2] = aPos.getZ(); m[3][3] = 1.0; }
/** * Create an OpenGL translation matrix from a 3-vector and a 3x3 matrix passed as a parameter. * * @param aPos * @param aRot */ public void set(final JVector3d aPos, final JMatrix3d aRot) { m[0][0] = aRot.m[0][0]; m[0][1] = aRot.m[1][0]; m[0][2] = aRot.m[2][0]; m[0][3] = 0.0; m[1][0] = aRot.m[0][1]; m[1][1] = aRot.m[1][1]; m[1][2] = aRot.m[2][1]; m[1][3] = 0.0; m[2][0] = aRot.m[0][2]; m[2][1] = aRot.m[1][2]; m[2][2] = aRot.m[2][2]; m[2][3] = 0.0; m[3][0] = aPos.getX(); m[3][1] = aPos.getY(); m[3][2] = aPos.getZ(); m[3][3] = 1.0; }