我想用ManualObject自己画一个圆柱，可是。。。

cutejade

        ManualObject * cylinder = pSceneManager->createManualObject("cylinder_name");

        float const radius = 300,
                thickness = 300, // Of course this must be less than the radius value.
                accuracy = 0.04;

        unsigned point_index = 0;
        for(float theta = 0; theta <= 2 * Math:I; theta += Math::PI / (radius * accuracy)) {
                cylinder->begin("Examples/MyRocky", RenderOperation::OT_TRIANGLE_STRIP);
                cylinder->position((radius - thickness) * cos(theta - Math::PI / (radius * accuracy)),0,(radius - thickness) * sin(theta - Math::PI / (radius * accuracy)));
                cylinder->textureCoord(0,0);
                cylinder->position(radius * cos(theta - Math::PI / (radius * accuracy)),0,radius * sin(theta - Math::PI / (radius * accuracy)));
                cylinder->textureCoord(1,0);
                cylinder->position(radius * cos(theta),0,radius * sin(theta));
                cylinder->textureCoord(1,1);
                cylinder->position((radius - thickness) * cos(theta),0,(radius - thickness) * sin(theta));
                cylinder->textureCoord(0,1);
                cylinder->end();
                ///////////////////////////////////////////////////////////////////////
                cylinder->begin("Examples/MyRocky", RenderOperation::OT_TRIANGLE_STRIP);
                cylinder->position((radius - thickness) * cos(theta - Math::PI / (radius * accuracy)),1000,(radius - thickness) * sin(theta - Math::PI / (radius * accuracy)));
                cylinder->textureCoord(0,0);
                cylinder->position(radius * cos(theta - Math::PI / (radius * accuracy)),1000,radius * sin(theta - Math::PI / (radius * accuracy)));
                cylinder->textureCoord(1,0);
                cylinder->position(radius * cos(theta),1000,radius * sin(theta));
                cylinder->textureCoord(1,1);
                cylinder->position((radius - thickness) * cos(theta),1000,(radius - thickness) * sin(theta));
                cylinder->textureCoord(0,1);
                cylinder->end();
                ///////////////////////////////////////////////////////////////////////
                     //这下面代码是画柱的侧面的！！！可是textureCoord（）怎么计算圆柱的纹理坐标呀？
                double u,v;
                cylinder->begin("Examples/MyRocky", RenderOperation::OT_TRIANGLE_STRIP);
                cylinder->position(radius * cos(theta - Math::PI / (radius * accuracy)),0,radius * sin(theta - Math::PI / (radius * accuracy)));
                this->GetUV(radius * cos(theta - Math::PI / (radius * accuracy)),0,radius * sin(theta - Math::PI / (radius * accuracy)),u,v);
                cylinder->textureCoord(u,v);
                cylinder->position(radius * cos(theta),0,radius * sin(theta));
                this->GetUV(radius * cos(theta),0,radius * sin(theta),u,v);
                cylinder->textureCoord(u,v);
                cylinder->position(radius * cos(theta - Math::PI / (radius * accuracy)),1000,radius * sin(theta - Math::PI / (radius * accuracy)));
                this->GetUV(radius * cos(theta - Math::PI / (radius * accuracy)),1000,radius * sin(theta - Math::PI / (radius * accuracy)),u,v);
                cylinder->textureCoord(u,v);
                cylinder->position(radius * cos(theta),1000,radius * sin(theta));
                this->GetUV(radius * cos(theta),1000,radius * sin(theta),u,v);
                cylinder->textureCoord(u,v);
                cylinder->end();
        }

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请问如果计算圆柱侧面的纹理坐标呀？

cutejade

没人理，自己顶一下！

yangyue811

我做过~邮箱yangyue811@yahoo.com.cn