Nov 16, 2013 · Shadow volumes, popularised by Carmack. Pixel perfect, reasonnably simple to implement, quite slow. Good for a few objects. No soft shadows. Shadow maps. A little hard to implement if you never made any openGL. Hard to get right. Pixellated shadows. Deals with lots of polygons. Doesn't deal with big worlds. Myriads of Shadow maps variants.

May 19, 2010 · There's no super simple way to do shadows. Sorry to disappoint you but shadows are one of the more complex problems in computer graphics, especially if they have to look good. Now with that said here are some maybe helpful links for further reading: The Theory of Stencil Shadow Volumes; Shadow Mapping with Today's OpenGL Hardware

Nov 21, 2010 · How can i make fast and easy shadow-casting in OpenGL, using "standard" (fixed) functions only? Note: the result must contain cube and sphere shadows as well. Note: the result must contain cube and sphere shadows as well.

Mar 15, 2014 · Goal: I want to render my scene with shadows, using deferred lighting and shadowmaps. Struggle: finding clear and consistent documentation regarding how to use shadow2D and sampler2DShadow. Here's what I'm currently doing:

Apr 4, 2012 · As you can see, the tops of the shadows look OK (if you look at the dirt where the tops of the shrubs are projected, it looks more or less correct), but the base of the shadows is way off. The bottom left corner of the image shows the shadow map I computed. It's a depth-map from the POV of the light, which is also where my character is standing.

Nov 29, 2009 · If you are serious about using OpenGL, I recommend either of the following: use an OpenGL debugger. There are a number of tools out there that will show the exact state at a specific draw call. build your own debugging state tracking; dump the OpenGL state of interest at the time of the draw.

This paper seems to cover your requirements, using OpenGL and hardware acceleration to create a detailed shadow map. If I were trying to accomplish this, I would be tempted to use ray casting. For each triangle in B, create a vector from the triangle to the light.

Oct 22, 2012 · Having shadows in a OpenGL rendered scene is not a matter of simply enabling some feature. OpenGL by itself just draws points, lines and triangles. One at a time and without any context between them. It's up to the user to provide the context. Drawing shadows can be implemented in several ways, but the most used are . Stencil Volume Shadows; and

Nov 18, 2016 · I'm adding shadows to a scene in OpenGL by doing two draw passes, one to a depth map and one to the normal frame buffer. Without using a bias when using the depth map, there is a lot of shadow acne. This is fixed by adding a bias to the depth map check.

Jun 20, 2018 · The point light shadows just dont show up for me. I think it is to do with the following line: float shadow = calculate_shadows(FragPos); as for directional shadows I multiple the fragpos with a lightSpaceMatrix (lightView * lightProj) and that worked, but for point shadows I dont have a lightSpaceMatrix to use. light fragment shader