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Re: Black spots on Interior
High HSph. Subdivs are often the IM culprit for long render times. Low min and max rates can speed up the render process by reducing the number of IM passes, but they have negligable speed effect on the final pass so it'll still take as long as it takes. This does however have a very considerable effect on the quality of the the final pass. Like it says in the manual, min -3 max 0 is the optimum setting to use: lower settings degrade quality (but are good for test renders) and higher cause unecessarily long render times due to excessive passes.
HSph. Subdivs on the other hand affect both IM passes and the final pass so have a considerable effect on the overall render time. For this reason I never go above 200 HSph. Subdivs and only then for models with extremely tricky textures like dark brick with white grout which tend to moire badly. As a general rule, HSph. Subdivs of 25 are fine for many arch renders, 50 is better and 100 is usually the most you'll need- see attachments and render speeds below. As usual though, there are loads of other factors involved like HDRI/LDRI GI map quality, textures, etc all of which make parameters more or less relevant depending on the model.
High HSph. Subdivs are often the IM culprit for long render times. Low min and max rates can speed up the render process by reducing the number of IM passes, but they have negligable speed effect on the final pass so it'll still take as long as it takes. This does however have a very considerable effect on the quality of the the final pass. Like it says in the manual, min -3 max 0 is the optimum setting to use: lower settings degrade quality (but are good for test renders) and higher cause unecessarily long render times due to excessive passes.
HSph. Subdivs on the other hand affect both IM passes and the final pass so have a considerable effect on the overall render time. For this reason I never go above 200 HSph. Subdivs and only then for models with extremely tricky textures like dark brick with white grout which tend to moire badly. As a general rule, HSph. Subdivs of 25 are fine for many arch renders, 50 is better and 100 is usually the most you'll need- see attachments and render speeds below. As usual though, there are loads of other factors involved like HDRI/LDRI GI map quality, textures, etc all of which make parameters more or less relevant depending on the model.
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