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我正在尝试在其顶部渲染对象的轮廓，但我遇到了一些困难。我对 OpenGL 不太了解，所以大部分来自以下教程。期望的效果应该是这样的：

但这是目前的结果：

我用来执行此操作的代码是：

GL11.glPushAttrib(GL11.GL_ALL_ATTRIB_BITS);
GL11.glEnable(GL11.GL_LIGHTING);
GL11.glClearStencil(0);
GL11.glClear(GL11.GL_STENCIL_BUFFER_BIT);
GL11.glEnable(GL11.GL_STENCIL_TEST);
GL11.glStencilFunc(GL11.GL_ALWAYS, 1, 0xFFFF);
GL11.glStencilOp(GL11.GL_KEEP, GL11.GL_KEEP, GL11.GL_REPLACE);
GL11.glPolygonMode(GL11.GL_FRONT_AND_BACK, GL11.GL_FILL);
GL11.glColor3f(0.0f, 0.0f, 0.0f);

// Render original.
this.doRender((AbstractClientPlayer) par1Entity, par2, par4, par6, par8, par9);

GL11.glDisable(GL11.GL_LIGHTING);
GL11.glStencilFunc(GL11.GL_NOTEQUAL, 1, 0xFFFF);
GL11.glStencilOp(GL11.GL_KEEP, GL11.GL_KEEP, GL11.GL_REPLACE);
GL11.glLineWidth(3.0f );
GL11.glPolygonMode(GL11.GL_FRONT_AND_BACK, GL11.GL_LINE);
GL11.glColor3f(1.0f, 1.0f, 1.0f);
GL11.glColor4f(1.0F, 0, 0, 0.5F);
GL11.glDisable(GL11.GL_TEXTURE_2D);

// Render stencil.
this.doRender((AbstractClientPlayer) par1Entity, par2, par4, par6, par8, par9);

GL11.glEnable(GL11.GL_TEXTURE_2D);
GL11.glColor4f(1.0F, 1, 1, 1F);
GL11.glPopAttrib();

并且doRender已经存在渲染播放器的方法。这方面的任何事情都会有所帮助。

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