haedri/shadow-mapping

Shadow mapping tutorial for LibGdx

shadow-mapping's Issues

directional light direction

Hi haedri, thank you for great tutorials,

I tried to change direction of light at part 2:

from this:

currentLight = new DirectionalLight(this, new Vector3(33, 10, 3), new Vector3(-10, 0, 0));

to this:

currentLight = new DirectionalLight(this, new Vector3(15, 10, 0), new Vector3(0, -10, 0));

However it does not create lighting as expected.

Using this values seems to be working (only x is different):

currentLight = new DirectionalLight(this, new Vector3(15, 10, 0), new Vector3(0.01f, -10, 0));

Maybe there is a bug at the framework, but I did not succeed at finding source of problem yet.

Mistake in tutorial part2 - Creating a depth shader

In my opinion your tutorial of "part2" contains a mistake.

See topic "Creating a depth shader":

Your fragment shader has the following line:

gl_FragColor = vec4(length(v_position.xyz-u_lightPosition)/u_cameraFar);

... and you said:

A darker pixel means the point is farther away from the camera.

But it is the other way round, it is more brighter if the point is farther away.
For instance, "v_position.xyz-u_lightPosition" would be 10 and u_cameraFar would be 10 too. than the result is 10/10 = 1.. the farthest distance possible. This will give us vec4(1.0f) seen as Color (gl_FragColor) would be white, rgba(255,255,255,255).

So your supporting image is also not correct.

Regarding to your source code example the result depthmap-image is also like my assumption.

See my attached image file;

So this part of your tutorial is a little confusing and finally not correct.. it costs me a few hours to find out ;-)

Nevertheless, thank you 'lot for this tutorial!

How to use with custom shaders?

I am trying to make it work with my custom shaders.
I have some model instances and some custom shaders with them. How can this adopt to work with that? I tried everything but I got strange results...