Increase pixel count lights on HDRP

I think there is some misunderstanding about how HDRP handles lights here.
- HDRP only does pixel lighting, no vertex lighting.
- It handles up to 24 lights per tile on screen (a tile is 16x16 pixels)

Are you talking about the baked shadowmask ? Indeed this is limited to 4 baked shadow mask (as it's store in only one texture, and it takes 1 color channel per shadows) and there is no way to increase this limit.

 

Hi, so as you are using shadow mask, you can only have 4 overlapping shadow at the same time. This is current limitation. However it doesn't restrict you to 4 shadowed light. You can have a lot of shadowed light as long as there is no more than 4 of them overlapping. Please see: https://docs.unity3d.com/Manual/LightMode-Mixed-Shadowmask.html and Light overlap: https://docs.unity3d.com/Manual/GIVis.html

 

Hey, if you have a large number of "Mixed" realtime lights, you might want to look into "Baked Indirect" bakes (without shadow masks): you'll still get great indirect light bounces, but direct light and shadows will be fully realtime.

If you use the "High quality" filtering for shadows in HDRP, you'll get great-looking soft shadows. Obviously, the cost will be higher than baking with shadow masks, but it might be more flexible for what you're trying to achieve, and iteration times will probably be lower, as indirect bakes usually require a much lower texel resolution to look decent (= faster bakes).

 

You will get real-time direct lighting (diffuse, spec and shadowing).

You won't indeed get real-time indirect lighting.