Java Using OpenGL Stencil to create Outline

问题

I'm trying to render an outline of an object over the top of it but I'm having some difficulties. I'm not too good with OpenGL so most of it was from following tutorials. The desired effect is supposed to be something like this:

But this is the outcome at the moment:

The code I'm using to do this is:

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();

And doRender is the method already there to render the player. Anything on this would be helpful.

来源：https://stackoverflow.com/questions/28008213/java-using-opengl-stencil-to-create-outline