https://community.graphisoft.com/t5/Archicad-C-API/Need-precision-on-C4D-light-properties/m-p/281330#M2173 <DIV class="actalk-migrated-content">The light properties as given by the ModelerAPI are a bit too rudimentary for me. For this reason I am enumerating C4D light properties by calling ModelerAPI::Light::GetExtraParameters()<BR /><BR />I found some documentation on C4D light properties here:<BR /><A href="http://gdl.graphisoft.com/tips-and-tricks/how-to-make-a-light-object" target="_blank" rel="noopener">http://gdl.graphisoft.com/tips-and-tricks/how-to-make-a-light-object</A><BR /><BR />However, I would need clarification on a couple of things.<BR /><BR /><BR />- Photometry units can be lumen or candela. I assume you mean "Candela per Square Meter" ? <BR /><BR />- What is c4dDetAreaX, c4dDetAreaY? I assume it's the area beyond which falloff starts to occur (eg: 100% light intensity within the area/volume, and starts to falloff beyond the area/volume)?<BR /><BR />- The documentation doesn't mention a c4dDetAreaZ for an omni light, but when I enumerate the properties I see a C4D_DET_AREAZ. I assume this is just a bug of the documentation?<BR /><BR />- What does c4dDetRadius mean? Is it the distance from which light goes from 100% to 0% but beyond the c4dDetAreaN? If so, then, along an axis, the light coverage and intensity curve would be something like this? <BR /><BR />total length of light coverage = c4dDetRadius + c4dDetAreaX + c4dDetRadius<BR />shape of light curve = ...oooOOO + ######### + OOOooo... <BR /><BR />- What is the unit of c4dDetRadius and Areas? I assume meters?<BR /><BR />- Can you describe the falloff behavior for an omni light with falloff geometry types of OMNI, SPOT, AREA, CONE, PYRAMID and how it relates to c4dDetFalloffAngle?<BR /><BR />- Why have to specify the light intensity in both Lumen and Candela? Why not specify a single unit and value, and let archicad convert between the two?<BR /><BR />- Can you confirm meaning for c4dPhoPhotometric? 1=photometric, or 0=non-photometric? How do you get intensity &amp; unit of non-photometric lights?<BR /><BR />- What is c4dVisBrightness? Is it a percentage multiplier to the light intensity, like a dimmer switch?<BR /><BR /><BR />Thank you!</DIV> Tue, 14 Sep 2021 07:28:58 GMT drjustice 2021-09-14T07:28:58Z https://community.graphisoft.com/t5/Archicad-C-API/Need-precision-on-C4D-light-properties/m-p/281330#M2173 <DIV class="actalk-migrated-content">The light properties as given by the ModelerAPI are a bit too rudimentary for me. For this reason I am enumerating C4D light properties by calling ModelerAPI::Light::GetExtraParameters()<BR /><BR />I found some documentation on C4D light properties here:<BR /><A href="http://gdl.graphisoft.com/tips-and-tricks/how-to-make-a-light-object" target="_blank" rel="noopener">http://gdl.graphisoft.com/tips-and-tricks/how-to-make-a-light-object</A><BR /><BR />However, I would need clarification on a couple of things.<BR /><BR /><BR />- Photometry units can be lumen or candela. I assume you mean "Candela per Square Meter" ? <BR /><BR />- What is c4dDetAreaX, c4dDetAreaY? I assume it's the area beyond which falloff starts to occur (eg: 100% light intensity within the area/volume, and starts to falloff beyond the area/volume)?<BR /><BR />- The documentation doesn't mention a c4dDetAreaZ for an omni light, but when I enumerate the properties I see a C4D_DET_AREAZ. I assume this is just a bug of the documentation?<BR /><BR />- What does c4dDetRadius mean? Is it the distance from which light goes from 100% to 0% but beyond the c4dDetAreaN? If so, then, along an axis, the light coverage and intensity curve would be something like this? <BR /><BR />total length of light coverage = c4dDetRadius + c4dDetAreaX + c4dDetRadius<BR />shape of light curve = ...oooOOO + ######### + OOOooo... <BR /><BR />- What is the unit of c4dDetRadius and Areas? I assume meters?<BR /><BR />- Can you describe the falloff behavior for an omni light with falloff geometry types of OMNI, SPOT, AREA, CONE, PYRAMID and how it relates to c4dDetFalloffAngle?<BR /><BR />- Why have to specify the light intensity in both Lumen and Candela? Why not specify a single unit and value, and let archicad convert between the two?<BR /><BR />- Can you confirm meaning for c4dPhoPhotometric? 1=photometric, or 0=non-photometric? How do you get intensity &amp; unit of non-photometric lights?<BR /><BR />- What is c4dVisBrightness? Is it a percentage multiplier to the light intensity, like a dimmer switch?<BR /><BR /><BR />Thank you!</DIV> Tue, 14 Sep 2021 07:28:58 GMT https://community.graphisoft.com/t5/Archicad-C-API/Need-precision-on-C4D-light-properties/m-p/281330#M2173 drjustice 2021-09-14T07:28:58Z