klepto2

Just my thought. The debug-build was mainly slower because the vulkan validation-layer kicks in and slows everything down. In Leadwerks there was also no difference between debug and release (for simple apps). 

2 Things:
I believe the WidgetBlock Family is not the right one, better use the unlit family for this. your sprite with the material has a size of 0,0 so it will never be displayed no matter what you try to do auto pixmap = CreatePixmap(iVec2(100, 100)); pixmap->Fill(Vec4(0.5f, 0.5f, 1, 1)); auto tex = CreateTexture(TEXTURE_2D, 100, 100, TEXTURE_RGBA, { pixmap }, 1, TEXTURE_CLAMP_UV); auto mtl = CreateMaterial(); mtl->SetTexture(tex); mtl->SetShadow(false); mtl->SetTransparent(true); mtl->SetShaderFamily(LoadShaderFamily("Shaders/Unlit.fam")); //Create pixmap sprite auto sprite = CreateSprite(world, 40, 40); sprite->SetPosition(20, 20); //sprite->SetViewMode(SPRITEVIEW_BILLBOARD); sprite->SetMaterial(mtl); sprite->SetText("Test"); sprite->SetRenderLayers(2); with these changes the colored sprite is visible in the lower left corner.

The settings are more or less a prototype done shortly before the beta release. I have not used any dpi scaling in the plugin but i plan to include it in a refactored version.  the stacksize error is new for me. Looks like a stack error with lua. could probably be a problem with either the dll for fetching the polyhaven api or the small json to lua extension i have added. 
I will investigate both.
Also as Josh said the polyhaven is not an official plugin, so bug reports should be added here: 
or you could send me a PM.

The sliding door component has a small bug in the load method:
if (t["enabled"].is_boolean()) enabled = t; should be:
if (t["enabled"].is_boolean()) enabled = t["enabled"]; otherwise after reloading the scene from a saved game the door becomes inactive.

Try this: i have added the diffuse layer, so the background is visible.
1. I changed the noise texture to the one used by shadertoy (using other textures might lead to artifacts)
2. I corrected the aspect ratio calculation you had p.x*= gl_FragCoord.x / buffersize.y; where is should be  p.x*= buffersize.x / buffersize.y;
Effect.zip