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Fix GLTF light import
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@ -7,17 +7,25 @@
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<tutorials>
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</tutorials>
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<members>
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<member name="color" type="Color" setter="set_color" getter="get_color" default="Color(0, 0, 0, 1)">
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<member name="color" type="Color" setter="set_color" getter="get_color" default="Color(1, 1, 1, 1)">
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The [Color] of the light. Defaults to white. A black color causes the light to have no effect.
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</member>
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<member name="inner_cone_angle" type="float" setter="set_inner_cone_angle" getter="get_inner_cone_angle" default="0.0">
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The inner angle of the cone in a spotlight. Must be less than or equal to the outer cone angle.
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Within this angle, the light is at full brightness. Between the inner and outer cone angles, there is a transition from full brightness to zero brightness. When creating a Godot [SpotLight3D], the ratio between the inner and outer cone angles is used to calculate the attenuation of the light.
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</member>
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<member name="intensity" type="float" setter="set_intensity" getter="get_intensity" default="0.0">
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<member name="intensity" type="float" setter="set_intensity" getter="get_intensity" default="1.0">
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The intensity of the light. This is expressed in candelas (lumens per steradian) for point and spot lights, and lux (lumens per m²) for directional lights. When creating a Godot light, this value is converted to a unitless multiplier.
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</member>
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<member name="light_type" type="String" setter="set_light_type" getter="get_light_type" default="""">
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The type of the light. The values accepted by Godot are "point", "spot", and "directional", which correspond to Godot's [OmniLight3D], [SpotLight3D], and [DirectionalLight3D] respectively.
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</member>
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<member name="outer_cone_angle" type="float" setter="set_outer_cone_angle" getter="get_outer_cone_angle" default="0.0">
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<member name="outer_cone_angle" type="float" setter="set_outer_cone_angle" getter="get_outer_cone_angle" default="0.785398">
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The outer angle of the cone in a spotlight. Must be greater than or equal to the inner angle.
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At this angle, the light drops off to zero brightness. Between the inner and outer cone angles, there is a transition from full brightness to zero brightness. If this angle is a half turn, then the spotlight emits in all directions. When creating a Godot [SpotLight3D], the outer cone angle is used as the angle of the spotlight.
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</member>
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<member name="range" type="float" setter="set_range" getter="get_range" default="0.0">
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<member name="range" type="float" setter="set_range" getter="get_range" default="inf">
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The range of the light, beyond which the light has no effect. GLTF lights with no range defined behave like physical lights (which have infinite range). When creating a Godot light, the range is clamped to 4096.
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</member>
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</members>
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</class>
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@ -5074,7 +5074,7 @@ Node3D *GLTFDocument::_generate_light(Ref<GLTFState> state, Node *scene_parent,
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const float range = CLAMP(l->range, 0, 4096);
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// Doubling the range will double the effective brightness, so we need double attenuation (half brightness).
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// We want to have double intensity give double brightness, so we need half the attenuation.
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const float attenuation = range / intensity;
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const float attenuation = range / (intensity * 2048);
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if (l->light_type == "point") {
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OmniLight3D *light = memnew(OmniLight3D);
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light->set_param(OmniLight3D::PARAM_ATTENUATION, attenuation);
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@ -5150,13 +5150,13 @@ GLTFLightIndex GLTFDocument::_convert_light(Ref<GLTFState> state, Light3D *p_lig
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OmniLight3D *light = cast_to<OmniLight3D>(p_light);
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l->range = light->get_param(OmniLight3D::PARAM_RANGE);
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float attenuation = p_light->get_param(OmniLight3D::PARAM_ATTENUATION);
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l->intensity = l->range / attenuation;
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l->intensity = l->range / (attenuation * 2048);
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} else if (cast_to<SpotLight3D>(p_light)) {
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l->light_type = "spot";
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SpotLight3D *light = cast_to<SpotLight3D>(p_light);
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l->range = light->get_param(SpotLight3D::PARAM_RANGE);
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float attenuation = light->get_param(SpotLight3D::PARAM_ATTENUATION);
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l->intensity = l->range / attenuation;
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l->intensity = l->range / (attenuation * 2048);
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l->outer_cone_angle = Math::deg2rad(light->get_param(SpotLight3D::PARAM_SPOT_ANGLE));
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// This equation is the inverse of the import equation (which has a desmos link).
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@ -42,12 +42,12 @@ protected:
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static void _bind_methods();
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private:
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Color color;
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float intensity = 0.0f;
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Color color = Color(1.0f, 1.0f, 1.0f);
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float intensity = 1.0f;
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String light_type;
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float range = 0.0f;
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float range = INFINITY;
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float inner_cone_angle = 0.0f;
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float outer_cone_angle = 0.0f;
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float outer_cone_angle = Math_TAU / 8.0f;
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public:
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Color get_color();
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