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Fix shadows for billboarded Sprite3D's

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Erik Johnson 2023-01-31 22:53:54 -05:00 • committed by Rémi Verschelde
parent 9272f7b53d
commit eab95698cd
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GPG key ID: C3336907360768E1
18 changed files with 66 additions and 26 deletions
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8
scene/resources/material.cpp
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@ -991,7 +991,8 @@ void BaseMaterial3D::_update_shader() {
case BILLBOARD_DISABLED: {
} break;
case BILLBOARD_ENABLED: {
code += " MODELVIEW_MATRIX = VIEW_MATRIX * mat4(INV_VIEW_MATRIX[0], INV_VIEW_MATRIX[1], INV_VIEW_MATRIX[2], MODEL_MATRIX[3]);\n";
// MAIN_CAM_INV_VIEW_MATRIX is inverse of the camera, even on shadow passes: this ensures the billboard faces the camera when casting shadows.
code += " MODELVIEW_MATRIX = VIEW_MATRIX * mat4(MAIN_CAM_INV_VIEW_MATRIX[0], MAIN_CAM_INV_VIEW_MATRIX[1], MAIN_CAM_INV_VIEW_MATRIX[2], MODEL_MATRIX[3]);\n";
if (flags[FLAG_BILLBOARD_KEEP_SCALE]) {
code += " MODELVIEW_MATRIX = MODELVIEW_MATRIX * mat4(vec4(length(MODEL_MATRIX[0].xyz), 0.0, 0.0, 0.0), vec4(0.0, length(MODEL_MATRIX[1].xyz), 0.0, 0.0), vec4(0.0, 0.0, length(MODEL_MATRIX[2].xyz), 0.0), vec4(0.0, 0.0, 0.0, 1.0));\n";
@ -999,10 +1000,11 @@ void BaseMaterial3D::_update_shader() {
code += " MODELVIEW_NORMAL_MATRIX = mat3(MODELVIEW_MATRIX);\n";
} break;
case BILLBOARD_FIXED_Y: {
code += " MODELVIEW_MATRIX = VIEW_MATRIX * mat4(vec4(normalize(cross(vec3(0.0, 1.0, 0.0), INV_VIEW_MATRIX[2].xyz)), 0.0), vec4(0.0, 1.0, 0.0, 0.0), vec4(normalize(cross(INV_VIEW_MATRIX[0].xyz, vec3(0.0, 1.0, 0.0))), 0.0), MODEL_MATRIX[3]);\n";
// MAIN_CAM_INV_VIEW_MATRIX is inverse of the camera, even on shadow passes: this ensures the billboard faces the camera when casting shadows.
code += " MODELVIEW_MATRIX = VIEW_MATRIX * mat4(vec4(normalize(cross(vec3(0.0, 1.0, 0.0), MAIN_CAM_INV_VIEW_MATRIX[2].xyz)), 0.0), vec4(0.0, 1.0, 0.0, 0.0), vec4(normalize(cross(MAIN_CAM_INV_VIEW_MATRIX[0].xyz, vec3(0.0, 1.0, 0.0))), 0.0), MODEL_MATRIX[3]);\n";
if (flags[FLAG_BILLBOARD_KEEP_SCALE]) {
code += " MODELVIEW_MATRIX = MODELVIEW_MATRIX * mat4(vec4(length(MODEL_MATRIX[0].xyz), 0.0, 0.0, 0.0),vec4(0.0, length(MODEL_MATRIX[1].xyz), 0.0, 0.0), vec4(0.0, 0.0, length(MODEL_MATRIX[2].xyz), 0.0), vec4(0.0, 0.0, 0.0, 1.0));\n";
code += " MODELVIEW_MATRIX = MODELVIEW_MATRIX * mat4(vec4(length(MODEL_MATRIX[0].xyz), 0.0, 0.0, 0.0), vec4(0.0, length(MODEL_MATRIX[1].xyz), 0.0, 0.0), vec4(0.0, 0.0, length(MODEL_MATRIX[2].xyz), 0.0), vec4(0.0, 0.0, 0.0, 1.0));\n";
}
code += " MODELVIEW_NORMAL_MATRIX = mat3(MODELVIEW_MATRIX);\n";
} break;