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Do Geometry Shader normal visualization in view-space to prevent perspective distortion.

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Joey de Vries
2020-06-04 17:41:32 +02:00
parent 3c5fd34424
commit 3615cfce79
2 changed files with 6 additions and 5 deletions
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6
src/4.advanced_opengl/9.3.geometry_shader_normals/9.3.normal_visualization.gs
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@@ -8,11 +8,13 @@ in VS_OUT {
const float MAGNITUDE = 0.2; const float MAGNITUDE = 0.2;
uniform mat4 projection;
void GenerateLine(int index) void GenerateLine(int index)
{ {
gl_Position = gl_in[index].gl_Position; gl_Position = projection * gl_in[index].gl_Position;
EmitVertex(); EmitVertex();
gl_Position = gl_in[index].gl_Position + vec4(gs_in[index].normal, 0.0) * MAGNITUDE; gl_Position = projection * (gl_in[index].gl_Position + vec4(gs_in[index].normal, 0.0) * MAGNITUDE);
EmitVertex(); EmitVertex();
EndPrimitive(); EndPrimitive();
} }

5
src/4.advanced_opengl/9.3.geometry_shader_normals/9.3.normal_visualization.vs
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@@ -6,13 +6,12 @@ out VS_OUT {
vec3 normal; vec3 normal;
} vs_out; } vs_out;
uniform mat4 projection;
uniform mat4 view; uniform mat4 view;
uniform mat4 model; uniform mat4 model;
void main() void main()
{ {
mat3 normalMatrix = mat3(transpose(inverse(view * model))); mat3 normalMatrix = mat3(transpose(inverse(view * model)));
vs_out.normal = vec3(projection * vec4(normalMatrix * aNormal, 0.0)); vs_out.normal = vec3(vec4(normalMatrix * aNormal, 0.0));
gl_Position = projection * view * model * vec4(aPos, 1.0); gl_Position = view * model * vec4(aPos, 1.0);
} }