How to highlight a entity's edge?

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Original post by all_names_taken The simplest method is to draw the object colored in the highlight color, with some scaling to make it larger than the original object. Do this drawing with depth writes turned off. Then, after this, draw the object as usual, with depth writes on again. There are more complex methods, depending on your application - depending on what is your bottleneck, depending on complexity of your monster models etc etc. but the method above is simple to implement and should work for most cases.

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Original post by all_names_taken The simplest method is to draw the object colored in the highlight color, with some scaling to make it larger than the original object. Do this drawing with depth writes turned off. Then, after this, draw the object as usual, with depth writes on again. There are more complex methods, depending on your application - depending on what is your bottleneck, depending on complexity of your monster models etc etc. but the method above is simple to implement and should work for most cases.

//renders the outline partglCullFace(GL_FRONT);glEnable(GL_CULL_FACE);glPolygonMode(GL_BACK, GL_LINE);glLineWidth(4);	//fat lines//glDisable(GL_DEPTH_TEST);glDepthMask(GL_FALSE);glDisable(GL_LIGHTING);glDisable(GL_TEXTURE_2D);glCallList(dispListSelected);//renders the regular object part				glEnable(GL_TEXTURE_2D);glEnable(GL_LIGHTING);glDepthMask(GL_TRUE);//glEnable(GL_DEPTH_TEST);glDisable(GL_LINE_SMOOTH);glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); //back to solid modeglDisable(GL_CULL_FACE);glCallList(dispList);

shipListSelected = glGenLists(1);glDisable(GL_TEXTURE_2D);glEnable(GL_COLOR_MATERIAL);glNewList(shipListSelected, GL_COMPILE);	glColor4f(0,0.6f,0,0.8f);	m.render();glEndList();shipList = glGenLists(1);glEnable(GL_TEXTURE_2D);glBindTexture(GL_TEXTURE_2D, shipTex);glNewList(shipList, GL_COMPILE);	glColor4f(1,1,1,1.0f);	m.render();glEndList();

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Original post by yahastu if youre using OGL a better method is to use fat line mode