If you want something light, then this:
15.6"
Lenovo Flex 2-15, i7-4510U + Nvidia 840M + (1920x1080 IPS; touch)+ 8GB SSGD + 500GB HDD@RM2799[2.3kg], 4GB, W8
*but I've heard users complaining about colour accuracy of the (possibly cheap) IPS screen, so better check if colour accuracy is important to you

If you don't mind something heavier (but more powerful in terms of CPU):
15.6"
MSI
GP60-2OD-034MY, i7-4700MQ + Nvidia GT740M + (1920x1080; anti-glare)@RM2999, 4GB, 750GB, W8, steel series KB

GP60-2PE-026MY, i7-4700HQ + Nvidia GT840M + (1920x1080; anti-glare) @RM3299[Dynaudio], 4GB, 1TB HDD, W8.1

**Price in RRP
Upgrade to 8GB RAM at least, it will help in your work.
Please take note that Nvidia 840M and GT740M are mere entry-level GPUs, not very made for 3D stuffs