Hi dpadam450,

Here's what I have so far.

My shader for building the depth buffer and shadows is done as follows and works correctly:

[source lang="cpp"] //Vertex
varying vec4 LightPosition;

void main()
{
gl_Position = ftransform(); // Get the actual in-scene vector position.
LightPosition = gl_Position; // Share this position with the fragment shader.
}

//Fragment
varying vec4 LightPosition;

void main()
{
gl_FragColor = vec4(LightPosition.z / LightPosition.w); // The color is the depth ratio.
}[/source]

This builds everything fine, and I've checked.

The actual code for the shaders that draw the scene are as follows:

[source lang="cpp"] //Vertex
uniform mat4 LightModelViewProjectionMatrix;
uniform mat4 WorldMatrix;

varying vec3 Normal;
varying vec4 LightCoordinate; // Position in model view projection space from the lights view.
varying vec4 WorldPosition; // Position in world space.

void main()
{
Normal = gl_Normal;
WorldPosition = WorldMatrix * gl_Vertex;
LightCoordinate = LightModelViewProjectionMatrix * gl_Vertex;
gl_Position = ftransform(); // Transform via fixed function into the viewer's view
gl_TexCoord[0] = gl_MultiTexCoord0;
}

//Fragment
uniform sampler2D DiffuseMap;
uniform sampler2D ShadowMap;
uniform mat4 WorldMatrix;
uniform float MinimumShadow;

varying vec3 Normal;
varying vec4 LightCoordinate;
varying vec4 WorldPosition;

void main()
{
// Direct lighting
// ------------------------------
vec4 Color = gl_LightSource[0].ambient;
vec3 l = normalize(gl_LightSource[0].position.xyz - WorldPosition.xyz); // direction to the light source

vec3 view_normal = normalize(gl_NormalMatrix * Normal);
vec3 view_light_direction = normalize(vec3(gl_LightSource[0].position)); //(WorldMatrix * vec4( LightPosition.x, LightPosition.y, LightPosition.z, 0 ) ).xyz;

//float lambert = max(dot(view_normal, view_light_direction), 0.2);
float lambert = max(dot(Normal, l), MinimumShadow);
Color.xyz *= lambert;

//Blend in Color from primary texture unit
Color.wxyz *= texture2D(DiffuseMap, vec2(gl_TexCoord[0])).wxyz;

// Shadow mapping
// ------------------------------
vec4 lcoord = LightCoordinate; // Fragment position in light space.
lcoord /= lcoord.w; // Project to cartesian space
lcoord.xy = lcoord.xy * 0.5 + 0.5; // Scale since light clipping space is in [-1,1] but texture space is [0,1]

float fragmentDepth = lcoord.w; // Depth of the fragment in light space.
float shadowMapDepth = texture2D(ShadowMap, lcoord.xy).x; // Depth in the shadow map.

float eps = 0.001; // depth bias
float shadow = fragmentDepth - eps > shadowMapDepth ? 0.5: 1.0;

gl_FragColor = Color * shadow;
}[/source]

This appears to be where I start having the screw-ups. Everything in the scene renders right -- except for the light. The Shadow Mapping part works great at the bottom, but the top part seems to be screwing up somehow. Mind you, I realize the correct code should be the first lambert (that is commented out). However, there are no shadows in this situation.

Now, I've got the position building correctly to what I believe it should be. In fact, it's at the point where I can render from the Light's viewpoint and it shows how I expect it to.

[source lang="csharp"] Single LightX = (Single)( Math.Cos( Radians ) );
Single LightY = 0.0f;
Single LightZ = (Single)( Math.Sin( Radians ) );
Double LightAngle = Radians / Math.PI * 180.0d;

Single[] LightDirection = new Single[] { LightX, LightY, LightZ, 0.0f };
Gl.glLightfv( Gl.GL_LIGHT0, Gl.GL_POSITION, LightDirection );[/source]

Does anything appear to be outwardly wrong?

This current code actually renders the shadows and light (but the light is incorrect).

Here's what that looks like:

https://plus.google....sts/GkWqzumYmKv

That is the problem I have with that code. When I do it with the other stuff that's commented out, I have flat shading with no shadows. It's as if I had just put a film over the screen and changed the color of it to darken the entire scene.

EDIT:

Just want to note that I changed the discussion of this and posted to a different topic (since this is no longer an accurate title and is a completely different issue altogether) : http://www.gamedev.net/topic/628307-help-with-shadow-mapping-and-multi-texturing/