Implements #189 using density to estimate radius

Still need to adjust attrib contributions by surface normal relation to camera direction

components/renderers/cpp/src/splat_render.cpp

@@ -259,6 +259,7 @@ void Splatter::_renderChannel(
 		if (is_4chan) {
 			ftl::cuda::splat(
 				accum_.getTexture<float4>(Channel::Normals),
+				accum_.getTexture<float>(Channel::Density),
 				accum_.getTexture<float4>(channel_out),
 				temp_.getTexture<int>(Channel::Depth2),
 				out.createTexture<float>(Channel::Depth),
@@ -268,6 +269,7 @@ void Splatter::_renderChannel(
 		} else if (is_float) {
 			ftl::cuda::splat(
 				accum_.getTexture<float4>(Channel::Normals),
+				accum_.getTexture<float>(Channel::Density),
 				accum_.getTexture<float>(channel_out),
 				temp_.getTexture<int>(Channel::Depth2),
 				out.createTexture<float>(Channel::Depth),
@@ -277,6 +279,7 @@ void Splatter::_renderChannel(
 		} else {
 			ftl::cuda::splat(
 				accum_.getTexture<float4>(Channel::Normals),
+				accum_.getTexture<float>(Channel::Density),
 				accum_.getTexture<uchar4>(channel_out),
 				temp_.getTexture<int>(Channel::Depth2),
 				out.createTexture<float>(Channel::Depth),