Hans Goudey
518c5ce4cd
This commit uses two changes to improve the performance of the point instance node. **Prevent Reallocations** At 64 bytes, the transform matrix for every instance is rather large, so reallocating the vector as it grows can become a performance bottle- neck. This commit reserves memory for the instances that will be added to prevent unecessary reallocations as the instance vector grows. In a test with 4 million instances of 3 objects in a collection, the node was about 40% faster, from 370ms to 270ms for the node. **Parallelization** Currently the instances are added by appending to a vector. By changing this slightly to fill indices instead, we can parallelize the operation so that multiple threads can fill data at the same time. Tested on a Ryzen 3700x, this reduced the runtime from the above 270ms to 44ms average, bringing the total speedup to ~8x. Note that displaying the instances in the viewport is still much slower than the calculations in node, this change doesn't affect that.