[SOLVED] No point light after vertex shader

Help & Support
1

Hi, All

I’ve added vertex shader to bend perspective. But after adding this shader all my point and spot lights stops working, there is no light on materials where I apply my vertex shader. Works only directional light. What the issue it can be? Thanks for help! Here is my vertex shader code.

uniform float bendX;
uniform float bendY;
uniform float cameraZ;
uniform mat4 matrix_view;

mat4 getModelMatrix() {
    #ifdef DYNAMICBATCH
    return getBoneMatrix(vertex_boneIndices);
    #elif defined(SKIN)
    return matrix_model * getSkinMatrix(vertex_boneIndices, vertex_boneWeights);
    #elif defined(INSTANCING)
    return mat4(instance_line1, instance_line2, instance_line3, instance_line4);
    #else
    return matrix_model;
    #endif
}

vec4 getPosition() {
    dModelMatrix = getModelMatrix();
    vec3 localPos = vertex_position;
    vec4 posW = dModelMatrix * vec4(localPos, 1.0);
    float depth = posW.z - cameraZ;
    depth *= depth;
    posW.y += depth * bendY;
    posW.x += depth * bendX;
    vec4 mvPosition = matrix_view * vec4(posW.xyz, 1.0);
    gl_Position = matrix_viewProjection * mvPosition;
    dPositionW = gl_Position.xyz;
    vec4 screenPos = matrix_viewProjection * posW;
    return screenPos;
}

vec3 getWorldPosition() {
    return dPositionW;
}

Thanks,
Maksym

2

Hi @koroldev and welcome,

Not sure if that’s the problem but:

Try doing your calculations against the localPos variable, that is the vertex_position attribute, before calculating the world position (posW).

I have a curved effect example here, that seems to work fine with point lights:

https://playcanvas.com/editor/scene/1353984

image
image1105×741 68.2 KB

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3

Thanks, a lot :grinning:
I just commented two lines and it helped.

vec4 getPosition() {
    dModelMatrix = getModelMatrix();
    vec3 localPos = vertex_position;

    vec4 posW = dModelMatrix * vec4(localPos, 1.0);
    
    float depth = posW.z - cameraZ;
    depth *= depth;
    posW.y += depth * bendY;
    posW.x += depth * bendX;

    //vec4 mvPosition = matrix_view * vec4(posW.xyz, 1.0);
    //gl_Position = matrix_viewProjection * mvPosition;
    
    dPositionW = posW.xyz;//gl_Position.xyz;

    vec4 screenPos = matrix_viewProjection * posW;
    return screenPos;
}
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