Spotlights, image graininess, material based light source Tweet

[ArchPrime]

A few possibly related questions:

How best to create spotlights with various parametric light spread and falloff attributes in ArchiCAD, such that they work in octane plugin without further messing around? The average user needs to integrate visualization with documentation processes (the whole point of BIM) so light sources in visualization need to remain synchronized with electrical/lighting plans in ArchiCAD plan views - moving or switching from one kind of spotlight to another - with known bulb light output attributes, needs to be reflected in the visualization.

Also, how can interior still and animated renderings avoid graininess where there needs to be multiple material based light sources with specific characteristics (see above) rather than say a general area light from a single polygon. Currently, even with 16000 samples, the results I am getting look very grainy

Also, if coloured glass is in front of a light source (eg stained glass windows in front of the sun) how can I get the glass colours to be projected in vibrant coherent patterns on the far wall or floor as the light passes through the glass? And without introducing graininess to the rendered scene? At best I can get lead light patterns to project, but any glass colour seems to be washed out, (unless I make the glass nearly completely opaque - which them means transparency is wrong) - see screenshot

[face_off]

How best to create spotlights with various parametric light spread and falloff attributes in ArchiCAD, such that they work in octane plugin without further messing around? The average user needs to integrate visualization with documentation processes (the whole point of BIM) so light sources in visualization need to remain synchronized with electrical/lighting plans in ArchiCAD plan views - moving or switching from one kind of spotlight to another - with known bulb light output attributes, needs to be reflected in the visualization.

You can enter real world light distributions with IES lights (details are in the manual).

Also, how can interior still and animated renderings avoid graininess where there needs to be multiple material based light sources with specific characteristics (see above) rather than say a general area light from a single polygon. Currently, even with 16000 samples, the results I am getting look very grainy

You probably need more light in the scene. A film camera will be grainy in low light too.

Also, if coloured glass is in front of a light source (eg stained glass windows in front of the sun) how can I get the glass colours to be projected in vibrant coherent patterns on the far wall or floor as the light passes through the glass? And without introducing graininess to the rendered scene? At best I can get lead light patterns to project, but any glass colour seems to be washed out, (unless I make the glass nearly completely opaque - which them means transparency is wrong)

The glass color needs to be put into the Transmission pin. Make sure Fake Shadows are enabled. Add some Caustic Blur too.

Paul

[rappet]

Also depending on imager settings the render can have a lot of details and information on contrast and light, even when appears to dark in rednered png file...
, but with tone correction in postproduction it can be surprigingly 'bright' and appealing