让学生准确的理解素描写生明暗变化规律,并且应用于具体的写生实践之中,这是素描基础训练教学的一个难点。因为现实中的状况是,学生学习概念掌握规律与实际训练存在着很大差距,往往是理论明白了,但在具体写生时就糊涂了,原因是在表现物体的明暗色调时没有一个深浅的依据。为此我采取了网格座标定色的教学方法,来解决教学中存在的亮部一样浅,暗部一样重,明暗交界线一样黑的问题。实践证明此教学方法效果较好。具体方法如下。 我采用石膏圆球模型做教具,首先在球体表面画出径纬网格,在教学中让学生把球体当成“地球仪” Allow students to accurately understand the variation of light and dark sketch sketching, and applied to the specific practice of sketching, which is drawing a basic training teaching a difficult point. Because the reality of the situation is that there is a big gap between the students learning the concept of mastery and actual training, the theory is often understood, but confused in the specific sketch, the reason is that in the performance of the light and shade of the object without a depth basis . To this end, I adopted a grid-based teaching method of fixed coordinates to solve the teaching of the existence of bright as shallow, dark as heavy, dark and dark border as black issues. Practice has proved that this teaching method is better. Specific methods are as follows. I use gypsum ball model to do teaching aids, the first surface of the sphere drawn diameter diagonal grid, in teaching students to the sphere as a “globe”