Troubleshooting a shadow mapping problem in three.js involving a ShaderMaterial that alters the positions of vertices

Within my current project, I have implemented a ShaderMaterial to depict terrains. The positions of the vertices are adjusted in the vertex shader based on information from a height map texture:

vec4 mvPosition = modelViewMatrix * vec4( position + normal * heightMapScale, 1.0);
gl_Position = projectionMatrix * mvPosition;

The terrain itself appeared fine, but upon attempting to place objects onto it, I noticed some peculiarities with the shadows. It seemed like the vertices were unaware of their updated positions :(

If you're interested, please follow the links below for screenshots and a live demo (Apologies for being unable to post images due to reputation limitations)

Screenshot: https://i.sstatic.net/Xw3ZI.jpg

Live Demo: http://jsfiddle.net/b2bfm8q3/2/

Observe how the cube on the left side displays a correct shadow, while the one on the right does not due to a mismatch in the shader that shifts the face upwards.

Any thoughts on how to address this issue?

Thank you

javascriptthree.jswebgl

Answer №1

Hey @gman, just wanted to extend my gratitude for your advice! I realized that more shaders should be tweaked in order to solve my issue. Specifically, the worldPosition variable in the worldpos_vertex needs to be updated as well:

// Adjusting the vertex position
"float fBump = position.x < 0. ? 0. : 350.;",
"vec4 newPosition = vec4( position + normal * fBump, 1.0);",
// Replacing THREE.ShaderChunk[ "default_vertex" ]
"vec4 mvPosition = modelViewMatrix * newPosition;",
"gl_Position = projectionMatrix * mvPosition;",
// Replacing THREE.ShaderChunk[ "worldpos_vertex" ]
"vec4 worldPosition = modelMatrix * newPosition;",

Check out the updated demo here: http://jsfiddle.net/b2bfm8q3/4/

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