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@@ -30,6 +30,8 @@ namespace igl
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float * quat);
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}
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+// Implementation
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+
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// Utility inline functions
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inline float _QuatD(int w, int h)
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{
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@@ -44,6 +46,9 @@ inline float _QuatIY(int y, int w, int h)
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return (-2.0f*(float)y + (float)h - 1.0f)/_QuatD(w, h);
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}
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+// This is largely the trackball as implemented in AntTweakbar. Much of the
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+// code is straight from its source in TwMgr.cpp
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+// http://www.antisphere.com/Wiki/tools:anttweakbar
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void igl::trackball(
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const int w,
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const int h,
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@@ -82,7 +87,11 @@ void igl::trackball(
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double qrot[4], qres[4], qorig[4];
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axis_angle_to_quat(axis,angle,qrot);
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- double nqorig = sqrt(down_quat[0]*down_quat[0]+down_quat[1]*down_quat[1]+down_quat[2]*down_quat[2]+down_quat[3]*down_quat[3]);
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+ double nqorig =
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+ sqrt(down_quat[0]*down_quat[0]+
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+ down_quat[1]*down_quat[1]+
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+ down_quat[2]*down_quat[2]+
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+ down_quat[3]*down_quat[3]);
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if( fabs(nqorig)>DOUBLE_EPS_SQ )
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{
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jalec