I am trying to measure the illuminace levels just behind the glass (vertical plane) on a south facing façade. The surface normal for the glazing is oriented inward. I used DIVA for grasshopper to create nodes and offset the nodes by 2” inches behind the glass (i.e. set Y –Vector to +0.17 to move the nodes). I am confused about two things
1) The sensor vector, in the panel output reports the vector to be (0, 1, 0), does this mean the sensor is looking in the Y direction? My intention is for the sensor to look towards the glass? , if the vector is incorrect, how do I transform it to the right direction?
2) Should I connect the “Analysis Vector” output node to the Vector node under DIVA daylight analysis?
Please see attached rhino file and GH file.
Appreciate your help and input.
In answer to your questions:
1) Yes. You want the sensors to have a (0,-1,0) vector (i.e. looking South).
2) Yes, but pass them through a "Neg" component first, which will flip their direction from (0,1,0) to (0,-1,0).
It worked.Thank you for saving my day.
Appreciate your timely response.