Upper Quadrant bright, the rest darker

[vrguru]

I have an issue where the upper quadrant of the screen is brighter (correct) than the rest (darker).
It only occurs if I enable the Surfel GI and is rendering a larger Heightfield mesh. (see image).
It does NOT occur otherwise. I have other scenes with larger scenes without these issues.
Any ideas of what is going on?

[turanszkij]

It could be resolution mismatch with some other setting, like upscaling, I'll investigate.

[vrguru]

Some additional potential hints?

If I enable DDGI (while having Surfel GI enabled) it disappears.
None of the Debugging views (for DDGI) show any "quadrant issues".

This is the code for toggling it:

    surfelGICheck.Create("Surfel GI");
    surfelGICheck.SetPos(XMFLOAT2(x, y));
    surfelGICheck.SetSize(XMFLOAT2(wid * 0.45f, itemH));
    surfelGICheck.SetCheck(wi::renderer::GetSurfelGIEnabled());
    surfelGICheck.OnClick([this](wi::gui::EventArgs args) {
        wi::renderer::SetSurfelGIEnabled(args.bValue);
        // Surfel GI uses single-sample depth for its GI resolve; MSAA > 1 causes
        // only the first GI tile (top-left quadrant) to be correctly upsampled.
        if (args.bValue && renderPath->getMSAASampleCount() > 1) {
            renderPath->setMSAASampleCount(1);
            msaaCombo.SetSelectedByUserdataWithoutCallback(1);
            renderPath->ResizeBuffers();
        }
    });

These are all the settings I have for the app:

{
"advanced_light_cull": false,
"ao": 3,
"ao_power": 0.25,
"ao_range": 1.0,
"ao_sample_count": 16.0,
"bloom": true,
"bloom_threshold": 9.630000114440918,
"brightness": 0.020400047302246094,
"capsule_shadow_angle": 45.0,
"capsule_shadow_fade": 0.7099999785423279,
"capsule_shadows": false,
"chromatic_aberration": false,
"chromatic_aberration_amt": 2.0,
"color_grading": false,
"contact_shadows": false,
"contact_shadows_range": 7.65369987487793,
"contact_shadows_steps": 43.0,
"contrast": 0.9368000030517578,
"crt_filter": false,
"ddgi": false,
"ddgi_blend_speed": 0.20000000298023224,
"ddgi_debug": false,
"ddgi_ray_count": 512,
"ddgi_smooth_backface": 0.009999999776482582,
"ddgi_x": 32,
"ddgi_y": 8,
"ddgi_z": 32,
"dither": false,
"dof": false,
"dof_strength": 10.0,
"env_map_intensity": 1.0,
"exposure": 1.080899953842163,
"eye_adaption": true,
"eye_adaption_key": 0.1350480020046234,
"eye_adaption_rate": 1.0,
"fsr1": false,
"fsr1_sharpness": 0.5040000081062317,
"fsr2": false,
"fsr2_preset": 3,
"fsr2_sharpness": 1.0,
"fxaa": true,
"game_speed": 1.0,
"gi_boost": 1.0,
"lens_flare": false,
"light_shafts": false,
"light_shafts_fade_speed": 3.0,
"light_shafts_strength": 0.5,
"mesh_blend": true,
"mesh_shader": false,
"meshlet_occ_culling": false,
"mip_lod_bias": 3.5916810035705566,
"motion_blur": false,
"motion_blur_strength": 100.0,
"msaa": 4,
"occlusion_culling": false,
"outline": false,
"outline_thickness": 2.3399999141693115,
"outline_threshold": 0.6370000243186951,
"pt_samples": 1024,
"raytrace_bounces": 9,
"raytraced_diffuse": true,
"raytraced_diffuse_quality": 2,
"raytraced_diffuse_range": 85.1500015258789,
"refl_roughness_cutoff": 0.06700000166893005,
"reflections": false,
"resolution_scale": 1.0,
"rt_reflections": false,
"rt_reflections_quality": 2,
"rt_reflections_range": 10000.0,
"saturation": 1.27839994430542,
"shadow_2d_res": 6,
"shadow_cube_res": 4,
"shadow_lod": true,
"shadow_type": 0,
"shadows": true,
"sharpen_amount": 0.0,
"sharpen_filter": false,
"ssgi": false,
"ssgi_depth_rejection": 100.0,
"ssr": false,
"ssr_quality": 2,
"streaming_threshold": 0.800000011920929,
"surfel_gi": true,
"temporal_aa": false,
"temporal_aa_debug": false,
"tessellation": true,
"texture_quality": 3,
"tonemap": 1,
"visibility_compute": false,
"vrs": false,
"vsync": false,
"vxgi": true,
"vxgi_max_distance": 13.84000015258789,
"vxgi_ray_step": 1.1485999822616577,
"vxgi_reflections": false,
"vxgi_voxel_size": 0.3928571343421936,
"wireframe": false
}

[vrguru]

Oh, you know what? I get it in the editor too! Just load the attached scene and enable Surfel GI.

Here is the scene that I loaded,

saved.zip

[turanszkij]

Still not happening for me. Can you also send your config.ini file from the editor?

[vrguru]

Hm, If I delete the config.ini (the one in the .zip file), the problem disappears, so when I enable Surfel GI I do not see the artefact.
But I see it in my application...so it is some sort of setting that I have?
It certainly seems to have something to do with some settings.

config.zip

[turanszkij]

It seems like RTDiffuse effect with quality setup 2 is causing the issue. I will investigate more sometime. In the meantime, don't use both of them together. Using both of them together doesn't make sense anyway because they will overwrite each other's results.