29 lines
1.0 KiB
Bash
29 lines
1.0 KiB
Bash
//这里是树干节点的顶点着色器
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//这里的所有的偏转角都是相对于Z轴正方向来说的，逆时针旋转的
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uniform mat4 uMVPMatrix; //总变换矩阵
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uniform float bend_R;//这里指的是树的弯曲半径
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uniform float direction_degree;//这里指的风向,用角度表示的，沿Z轴正方向逆时针旋转
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attribute vec3 aPosition; //顶点位置
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attribute vec2 aTexCoor; //顶点纹理坐标
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varying vec2 vTextureCoord; //用于传递给片元着色器的变量
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void main()
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{
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//计算当前的弧度
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float curr_radian=aPosition.y/bend_R;
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//计算当前点的结果高度
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float result_height=bend_R*sin(curr_radian);
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//计算当前点的增加的长度
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float increase=bend_R-bend_R*cos(curr_radian);
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//计算当前点最后的x坐标
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float result_X=aPosition.x+increase*sin(radians(direction_degree));
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//计算当前点最后的z坐标
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float result_Z=aPosition.z+increase*cos(radians(direction_degree));
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//最后结果
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vec4 result_point=vec4(result_X,result_height,result_Z,1.0);
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gl_Position = uMVPMatrix * result_point; //根据总变换矩阵计算此次绘制此顶点位置
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vTextureCoord = aTexCoor;//将接收的纹理坐标传递给片元着色器
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}
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