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I really like your interior that was fantastic and I like it,I also planned for interior of my house ,you share some more picture of your house so it can be help me in my work,I had some plan but I need your advice.
Although I am also a rookie
here are my critisim
The materials placed on the door are looking kinda fake..so for this you can increase the bump intensity
To bring some light in the scene..add some Rectangular light ..invisible onces
Good work, but you should level up your samples, because right wall has some glitches. Also, table material needs a bump, and carpet is too reflective.
Go to settings of vray, then to irradiance map, and level up samples, from 20 to 40. But anyways, your lighting should be as good as to be enough about 20 samples
The best solution for interior is Irr Map and Light Cache. The stain on the wall happen because that area is very dark and V-Ray trow less samples on the dark areas. If you notice in your render , you don't have splotchiness on the bright areas. Also if you have emissive materials with a very high intensity on those scone lamp, that could be the problem too. Small objects with a very high intensity emissive material, produce splotchiness. On the Irr Map we have some parameters and they control different thing. The Rates (Max and Min) control how many sample V-Ray will trow per pixel. So if you need more samples you could increase those option to trow more samples, thus more quality and cleaner render and also ore render time. Other option is the Hsph Subdivs. this option control the quality of the samples. More Hsph Subdivs, more ray to define the color of the pixels, meaning less splotchiness. Other very important parameter to avoid the splotchiness is the samples, this option basically control the blending (smoother) of the samples. If you increase this value you will get a better blending (smoother result), thus less splotchiness. But if you increase this value too much you can smooth the shadows (specially small contact shadows) and some object like chair could appear like floating on air.
So, first try to increase the HSph Subdivs to something between 80 - 100, if you still have the splotchiness, you could increase the Samples between 30-50. If you still having the splotchiness, you have to trow more samples using the "Rates" ( Max and Min).
If you are using emissive material on the lamps, try to use rectangular lights.
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