How to fix shadow not casted to terrain when rendering using default and terrain shader (depth shader included)?

Question

Given that I have the TerrainShader class and DefaultShader class. Also a FBO (Frame Buffer Object) shadow map

The TerrainShader has all the terrain, light, shadow related calculations. While the DefaultShader has the generic objects light, shadow related calculations.

I have successfully cast a directional shadow map when I only use DefaultShader alone with random cube objects and a plane. Now the problem was when I move or use a terrain instead of TerrainShader, the shadow is not cast in the terrain.

Question: Am I using the FBO the correct way or I am doing it wrong.

Solution Idea (Not yet applied)

• Merge terrain and default shader as one and create a flag if object or terrain will be rendered? (Still not sure if this is correct.)

Pseudocode (Current successful implementation)

• Create shadow map fbo
• Create default shader
• Create depth shader
• bind shadow map fbo
• clear depth
• render cubes & plane using depth shader (mvp)
• unbind shadow map fb
• clear color and depth
• render cubes & plane using default shader

Pseudocode (with Terrain shadow not working)

• Create shadow map fbo
• Create default shader
• Create terrain shader
• Create depth shader
• bind shadow map fbo
• clear depth
• render cubes & plane using depth shader (mvp) and exclude terrain
• unbind shadow map fb
• clear color and depth
• render cubes using default shader
• render terrain using terrain shader

Answer 1

I turns out that I made a mistake, I have filtered out terrain in the list of entities. So by including the terrain again, the shadow map is now displayed in terrain