Clean up

src/textures/color_ramp.cpp

@@ -24,7 +24,7 @@ ColorRamp texture (:monosp:`color_ramp`)
 ---------------------------------
 
 .. pluginparameters::
- :extra-rows: 7
+ :extra-rows: 10
 
  * - filename
    - |string|
@@ -85,21 +85,8 @@ ColorRamp texture (:monosp:`color_ramp`)
    - Tensor array containing the texture data.
    - |exposed|, |differentiable|
 
-This plugin provides a bitmap texture that performs interpolated lookups given
-a JPEG, PNG, OpenEXR, RGBE, TGA, or BMP input file.
-
-When loading the plugin, the data is first converted into a usable color representation
-for the renderer:
-
-* In :monosp:`rgb` modes, sRGB textures are converted into a linear color space.
-* In :monosp:`spectral` modes, sRGB textures are *spectrally upsampled* to plausible
-  smooth spectra :cite:`Jakob2019Spectral` and stored an intermediate representation
-  that enables efficient queries at render time.
-* In :monosp:`monochrome` modes, sRGB textures are converted to grayscale.
-
-These conversions can alternatively be disabled with the :paramtype:`raw` flag,
-e.g. when textured data is already in linear space or does not represent colors
-at all.
+This plugin provides an interpolator based on the bitmap texture factor. It currently supports RGB and monochrome modes.
+The interpolation for Spectral mode will be added.
 
 .. tabs::
     .. code-tab:: xml
@@ -348,6 +335,7 @@ class ColorRamp final : public Texture<Float, Spectrum> {
 
     }
 
+    // Interpolate RGB
     UnpolarizedSpectrum eval(const SurfaceInteraction3f &si,
                              Mask active) const override {
         MI_MASKED_FUNCTION(ProfilerPhase::TextureEvaluate, active);
@@ -374,6 +362,8 @@ class ColorRamp final : public Texture<Float, Spectrum> {
                     if (channels == 1)
                         return interpolate_1dim_bitmap(si, active);
                     else {
+                        // This function is equivalent to removing ColorRamp node between bitmap texture and bsdf
+                        // TODO: Add spectral mode for ColorRamp
                         if constexpr (is_spectral_v<Spectrum>)
                             return interpolate_spectral(si, active);
                         else
@@ -386,6 +376,7 @@ class ColorRamp final : public Texture<Float, Spectrum> {
         }
     }
 
+    // Interpolate Float properties such as roughness, specular, etc.
     Float eval_1(const SurfaceInteraction3f &si,
                  Mask active = true) const override {
 
@@ -555,12 +546,13 @@ class ColorRamp final : public Texture<Float, Spectrum> {
     std::string to_string() const override {
         if (m_bitmap_factor) {
             std::ostringstream oss;
-            oss << "BitmapTexture[" << std::endl
+            oss << "ColorRamp[" << std::endl
                 << "  name = \"" << m_name << "\"," << std::endl
                 << "  resolution = \"" << resolution() << "\"," << std::endl
                 << "  raw = " << (int) m_raw << "," << std::endl
                 << "  mean = " << m_mean << "," << std::endl
                 << "  transform = " << string::indent(m_transform) << std::endl
+                << "  number of band = " << string::indent(m_num_band) << std::endl
                 << "]";
             return oss.str();
         }