According to the system requirements posted by Lumion Software:

10k PassMark points for CPU: Min entry i7 4790
8k PassMark points for GPU: Min entry RX480/GTX970/GTX1060

If you follow all the recommended specs then it will be over your budget. Recommended specs includes an i7 processor (will use i7 7700 instead of i7 4790 because the latter is long obsoleted and replaced by the latest gen which is the former), 16GB DDR4 RAM, GTX1060 6GB as GPU, 1TB HDD (SSD is not included), a 80+ Gold rated good quality PSU (not necessary need to follow this as this is just a recommendation from them after all but it is good to keep this) and a standard ATX casing with a mATX mobo (with 4 RAM slots for future RAM expansion).

Intel Core i7 7700 - RM 1424
Gigabyte B250M-D3H - RM 419
G.SKill Aegis 16GB (8GB x 2) DDR4 2400MHz RAM - RM 550
Palit GTX1060 6GB GDDR5 Dual - RM 1229
WD Blue 1TB HDD - RM 219
EVGA SuperNova 550 G2 - RM 459
Tecware Edge - RM 149

Total: RM 4449 (E TECH price inclusive of GST)

At last, monitor with 1080p resolution is not included too, FYI.