Tips for speeding up rendering of V-ray scene with opacity maps. (For example when making leaves for a tree)Here few things I tried that have worked for me in the past.
1. Create a VrayMaterial with a bitmap in the diffuse slot and opacity map in opacity slot. Then change Opacity maps blur value to 0,01 and under "Filtering" choose None.
2. Use textured leafs with opacity map only when they are close to the camera. Otherwise use modelled leafs without opacity maps or complex bitmap textures.
3. Reduce reflection glossiness of the leafs. No reflection = faster rendering. If you need glossiness then tick the "Use interpolation" option in vraymaterial and fix the values in "Reflect interpolation" tab.
4. Use uncompressed texture maps like TIFF, TGA and PSD instead of JPG. Don´t use texture maps with unnecessary large resolution!
5. Turn the shadows off if you don´t need them for that specific object. Right click on the object. Choose Object properties and unclick "Cast shadows".
6. In some situations you might want to try unclicking the Double-sided option under Options tab, but use it only when it looks okey for your render.
I heard about these methods also, but I haven´t tried them yet:7.
8.
P.S. "How to deal with memory problems while rendering large images" can be found in my new article and "How to speed up your overall V-ray rendering" can be found in my earlier article.
