protected void _LoadLightParameters(SasLight light, string bindbase)
        {
            const string sas = "Sas.";
            const string ins = "[*]";
            const string in0 = "[0]";

            string bind_ins = sas + bindbase + ins;
            string bind_in0 = sas + bindbase + in0;

            EffectParameter l = _GetParameterByDualSasBind(bind_in0, bind_ins);
            if (l != null)
            {
                light.SasLightColor = l.StructureMembers["Color"];
                light.SasLightPosition = l.StructureMembers["Position"];
                light.SasLightDirection = l.StructureMembers["Direction"];
                light.SasLightRange = l.StructureMembers["Range"];
            }

            if (light.SasLightColor == null)
                light.SasLightColor = _GetParameterByDualSasBind(bind_in0 + ".Color", bind_ins + ".Color");
            if (light.SasLightPosition == null)
                light.SasLightPosition = _GetParameterByDualSasBind(bind_in0 + ".Position", bind_ins + ".Position");
            if (light.SasLightDirection == null)
                light.SasLightDirection = _GetParameterByDualSasBind(bind_in0 + ".Direction", bind_ins + ".Direction");
            if (light.SasLightRange == null)
                light.SasLightRange = _GetParameterByDualSasBind(bind_in0 + ".Range", bind_ins + ".Range");
        }
        protected override void _ClearParameters()
        {
            base._ClearParameters();

            for (int i = 0; i < _textureBinds.Count; i++)
                _textureBinds[i].Parameter = null;

            for (int i = 0; i < _floatBinds.Count; i++)
                _floatBinds[i].Parameter = null;

            _sasLights = new SasLight();
            _sasLightCount = null;

            _sasDirectionalLightCount = null;
            _sasDirectionalLights = new SasLight();

            _sasPointLightCount = null;
            _sasPointLights = new SasLight();

            _sasWorldMatrixCount = null;
            _sasWorldMatrix = null;
            _sasWorldInverseMatrix = null;
            _sasWorldViewMatrix = null;
            _sasWorldViewProjectionMatrix = null;
            _sasViewMatrix = null;
            _sasViewInverseMatrix = null;
            _sasViewProjectionMatrix = null;
            _sasProjectionMatrix = null;

            _sasTimeNow = null;
            _sasTimeLast = null;
            _sasTimeElapsed = null;
            _sasTimeFrameNumber = null;

            _viewportScaleAndOffset = null;
            _viewportUVMinMax = null;
        }