Humanism had a tremendous impact on the renaissance for a number of reasons some of the era's most prominent thinkers came together to discuss humanist concepts, sparking their own work and strengthening their relationships with each other.
The beginning of the renaissance in the mid-fourteenth century was marked by a turn from medieval life and values dominated by the church toward the philosophical principles of humanism the major.
While naturalism had more influence on form in italian renaissance art, humanism had more influence on its subject matter leonardo da vinci (1452-1519) 'vitruvian man' (c1490) renaissance humanism could be defined by protagoras'  statement that 'man is the measure of all things' in simple terms, this meant that any individual could shape their own character and influence their own future by the way they lived their life.
A second effect of humanism on renaissance art was the imitation, or the rebirth, as the word 'renaissance' implies, of the ancient greek and roman cultures during the medieval period of history, most art produced was centered on the church.
Medieval art only dealswith christianity or, occasionally, serves the purposes of wealthynobility renaissance art celebrates individuals of the middleclass there are thousands of portraits of merchants, scholars,musicians, wives, and children humanism considers that people can solve difficulties on their own,without the help of god.
Explain how the rise of humanism influenced renaissance art what´s humanism according to dictionarycom, humanism is the philosophy of life that, without theism and other supernatural beliefs, affirms our ability and responsibility to lead ethical lives of personal fulfillment that aspire to greater good of humanity.